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Chaosium, (kay-OSS-ee-yum) is known for publishing high quality books & games, and for having a well-developed sense of fun.

In 1975 we were founded as The Chaosium. In 1980 we incorporated as Chaosium Inc. Chaosium thrives in the mild climate, gorgeous surroundings, and gentle earthquakes of the San Francisco Bay Area.

Our main office is in Hayward, located about half-way between San Francisco and San Jose. A short walk away is a very good micro-brewery (and one of the oldest!) and Charlie Krank’s home. Charlie is our president and resident BBQ expert.

Most of Chaosium's product lines are based upon literary sources. H.P. Lovecraft's 1920's horror fiction provides the basis of our classic Call of Cthulhu roleplaying game line which has won so many awards that we have lost count, though we do know that there are more than 70 of them. Mr. Lovecraft also provides the inspiration for our many Chaosium Fiction collections. We are now expanding our fiction offering to include other, related, genres.

 Hottest Call of Cthulhu, Spanish (and English) from Chaosium

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Call of Cthulhu

Call of Cthulhu


Horror Roleplaying in the Worlds of H. P. Lovecraft The Great Old Ones ruled the earth aeons before the rise of humankind. Originally they came from the gulfs of space and were cast down by even greater beings. Remains of their cyclopean cities and forbidden knowledge can still be found on remote islands in the Pacific, buried amid the shifting sands of vast deserts, and in the frigid recesses...   [click here for more]
Chaosium  $34.95 $19.22

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Call of Cthulhu 7th Edition Quick-Start Rules

Call of Cthulhu 7th Edition Quick-Start Rules


Horror Roleplaying in the Worlds of H.P. Lovecraft The Great Old Ones ruled the earth aeons before the rise of humankind. Originally they came from the gulfs of space and were cast down by even greater beings. Remains of their cyclopean cities and forbidden knowledge can still be found on remote islands in the Pacific, buried amid the shifting sands of vast deserts, and in the frigid recesses...   [click here for more]
Chaosium   FREE 

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Call of Cthulhu Quick-Start Rules

Call of Cthulhu Quick-Start Rules


Horror Roleplaying in the Worlds of H.P. Lovecraft The Great Old Ones ruled the earth aeons before the rise of humankind. Originally they came from the gulfs of space and were cast down by even greater beings. Remains of their cyclopean cities and forbidden knowledge can still be found on remote islands in the Pacific, buried amid the shifting sands of vast deserts, and in the frigid recesses...   [click here for more]
Chaosium   FREE 

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Cthulhu Dark Ages

Cthulhu Dark Ages


Call of Cthulhu Roleplaying in the Year 1000 A.D. The Dark Ages world is filled with life, death, and the pain of old age. Vengeful hordes wash across the world. Petty warlords fight among themselves like ravenous dogs. Disease runs rampant. Illiterate city-folk and simple farmers dread that which lurks in the dark. And in the greatest abbeys, a few know of forbidden books that speak of blasphemy...   [click here for more]
Chaosium  $23.95 $13.17

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1920s Investigator's Companion

1920s Investigator's Companion


An Essential Guide for Players When faced with the horrors of the Cthulhu Mythos, investigators need all the help that they can get. This essential player's aid for Call of Cthulhu provides it. The 1920s Investigator's Companionis split into four sections. "The Roaring Twenties" details life in the 1920s, from a general historical overview to listing of favorite songs, books,...   [click here for more]
Chaosium  $14.95 $8.22

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1990's Handbook

1990's Handbook


The ideas presented in this book attempt to be both mundane and fantastic at the same time— plausability is the key. It is in the details that the horror lies, because it is in the credibility of the details that the fantastic can rise and stand. This, then, is a book of details, most mundane, some fantastic. They have but one purpose—that of bringing Lovecraft's horror home to us...   [click here for more]
Chaosium  $12.95 $7.12

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A Cthulhian Miscellany

A Cthulhian Miscellany


Terrifying Tools and Reality-Wrenching Rules for Players and Keeper Alike Call of Cthulhu is, of course, an excellent role-playing system and one that easily lends itself to expansion in many areas. In keeping with that spirit, this book explores a number of optional expansions to the original Call of Cthulhu rules-primarily in the areas of new, specialized skills; new spells, books,...   [click here for more]
Chaosium  $19.00 $10.45

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A Resection of Time

A Resection of Time


A Resection of Time is a short campaign for Call of Cthulhu set in the modern day. It begins in early April, in San Francisco, and ends a little later in the steamy jungles of Belize, in Central America. Before plunging into the dark heart of the ancient Mayan world, the investigators also travel to Los Angeles and shadowy Arkham. The details of Mayan architecture, culture, epigraphy,...   [click here for more]
Chaosium  $11.95 $6.57

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Arkham Now

Arkham Now


Revisiting the Legend-Haunted City ARKHAM NOW updates to modern times the famous and fabled city of Arkham for the Call of Cthulhu roleplaying game. Most residents believe there is only one horror lurking in this legendary haunted town — the urban sprawl slowly eroding Arkham's old New England beauty. Rushing by neon signs and mega-marts to obtain even more material possessions,...   [click here for more]
Chaosium  $27.95 $15.37

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Arkham Sanitarium

Arkham Sanitarium


The batle against the horrors of the myihos often leaves an investigator dead or insane. In either case, a paper trail has formed, one that can lead new, ignorant investigators into realms of unspeakable evil. This supplement contains a large number of useful forms for use in a Call of Cthulhu® game. Death certificates, insanity certificates, patient records, and even fingerprint forms...   [click here for more]
Chaosium  $14.95 $8.22

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Atomic-Age Cthulhu

Atomic-Age Cthulhu


MYTHOS HORROR IN THE 1950s NEVER BEFORE had the world faced a threat as potentially devastating as the A-bomb -- and the even more lethal H-bomb that followed. Educational films showed how to "survive" a nuclear blast by crawling under a desk, as if a few inches of wood made any difference. In movie theaters, classic monsters of the '30s and '40s were replaced by...   [click here for more]
Chaosium  $31.95 $17.57

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Beyond the Mountains of Madness

Beyond the Mountains of Madness


An Epic Antarctic Campaign & Sourcebook Little by little they rose grimly into the western sky; allowing us to witness the various bare, bleak, and blackened summits . . . in the reddish Antarctic lights against the provocative background of iridescent ice-dust clouds. In the whole spectacle there was a persistent, pervasive hint of stupendous secrecy and potential revelation. . . . I could...   [click here for more]
Chaosium  $39.95 $21.97

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Big Book of Cults

Big Book of Cults


Evil Cults for Call of Cthulhu This book contains a collection of modern-day organisations for use in your Call of Cthulhu games. The Church of a Thousand Tomorrows can nuke you from orbit, while the Sufferers' Guild could be brought down with a few well-placed phone calls. More importantly, all the personalities described have reasons for the things they do. Some of the characters want...   [click here for more]
Chaosium  $18.00 $9.90

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Blood Brothers

Blood Brothers


13 Titillating Tales "...and I would have got away with it too if it hadn't been for you meddling investigators and your stupid dog!"   —Frustrated Cultist upon arrest by local authorites. Do you have gaming buddies coming over tonight and don't know what to wear, or more importantly what game you'll run? Blood Brothers to the rescue! We'll...   [click here for more]
Chaosium  $18.95 $10.42

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Blood Brothers II

Blood Brothers II


9 Glimpses of Horror "Ooh, those A-li-ens, A-li-ens On a weekend from Mars They liked our girls and our cars- Ooh, those A-li-ens, A-li-ens" —From the Blood Brothers 2 soundtrack. They're B-movies, they're bad, and they're back for more laughs. Nine scenarios which have more to do with bad horror films than with H.P. Lovecraft. Microwave the popcorn,...   [click here for more]
Chaosium  $18.95 $10.42

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Bride of Halloween Horror

Bride of Halloween Horror


Autumn — the time of the Festival of the Dead, when the veil between the worlds is thinnest and prayers to ancestors easiest made. Pumpkin cakes are left in the Ancestors' Niche in every house, and children tie black and orange ribbons to the doors and put candles in the windows of their houses so their dead ancestors can easily find their way home. It is a quiet time, after the harvest...   [click here for more]
Chaosium  $18.95 $10.42

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Caligo Accedendum

Caligo Accedendum


Three Cthulhu Dark Ages Adventures This monograph constitutes Chaosium's first GenCon tournament for Cthulhu Dark Ages. The staffers chose the Latin name, which translates to "the approaching darkness". It also makes for a nifty acronym that fits in well with the Lovecraft Mythos. The first scenario, Island of the Damned takes tough-as-nails Viking characters completely out...   [click here for more]
Chaosium  $17.00 $9.35

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Canis Mysterium

Canis Mysterium


Constable Clark of Coldwater Falls, was desperate for attention. He'd been in touch with every sanatorium and hospital from New York to Boston and there's not an empty bed to be found since the stock market crash of last year. They're full to brimming with suicidal businessmen and investors. He is holding a man in his jail exhibiting some rather extraordinary behaviors. The delusion is complete...   [click here for more]
Chaosium  $10.95 $6.02

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Casting Call of Cthulhu

Casting Call of Cthulhu


Modern-Day Non-Player Characters This is a collection of 120 Modern-Era NPCs for overworked keepers to use in their games and campaigns. These NPCs are ones typically found in society and can provide useful information, assistance, or adventuring opportunities for Investigators. All are complete with Statistics, skills, a physical description, and a brief, but highly individualized...   [click here for more]
Chaosium  $16.00 $8.80

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Children of the Storm

Children of the Storm


Call of Cthulhu in the Great Depression Experts predict that the want and suffering of the Great Depression will create "a generation of cannibals." Panicked people flee their homes to escape a devastating invasion and poison gas attack. Life comes to a standstill as people watch a strange dust descend from the sky. The spread of the Great Depression and the first rumblings of...   [click here for more]
Chaosium  $14.95 $8.22

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Christmas in Kingsport

Christmas in Kingsport


Five Tales for a Not-So-Silent Night Some time ago we asked you to submit adventures concerning the holiday season. This monograph contains five tales certain to scare the stockings off the mantle. Silent Night Set in Arkham in December of 2001, this tale involves four investigators gathered to celebrate the season, the mythos far away for the moment. The Gaudy The investigators are invited...   [click here for more]
Chaosium  $13.00 $7.15

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Cthulhu by Gaslight

Cthulhu by Gaslight


Horror Roleplaying in 1890s England IN THE 1890s, Cthulhu and his minions share the globe with the mighty British Empire. But they owe allegiance to an empire of their own — a dark and cruel design on ownership of the world and on the dreams of humanity. Even among the green fields of rural England, only thoughtful and energetic intervention keeps the shadows at bay. CTHULHU...   [click here for more]
Chaosium  $28.95 $15.92

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Cthulhu Companion

Cthulhu Companion


Ghastly Adventures & Erudite Lore This book is composed of submissions to Different Worlds magazine and other Cthulhoid Chaosium projects. The Different Worlds readers’ enthusiasm for the Cthulhu Mythos resulted in many excellent submissions, some of which appear, with permission, within these pages. The contents of this supplement are quite varied. The first two...   [click here for more]
Chaosium  $7.95 $4.37

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Cthulhu For President: The Game

Cthulhu For President: The Game


The Aeon of the Elder Party Has Arrived! A 9th Level Beer and Pretzels Role-Playing Game.* Have you lost all hope in the future? Tired of Big Government? Sick of greedy, corrupt officials? You are not alone! Become one with the Elder Party! The greatest evil in the universe just sunk to new depths, and has announced his intention to enter politics. Don't settle for the lesser evil! Heed the...   [click here for more]
Chaosium  $15.00 $8.25

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Cthulhu Invictus

Cthulhu Invictus


Horror Roleplaying in Ancient Rome ROMAN CHILDREN TREMBLE in their beds as their mothers tell them stories of Medusa, the Hundred-Handed Ones, and the War of the Titans. They pray that the Fates have woven a long skein for them, free from encounters with the Minotaur and Cerberus. Little do they know that things more horrible than the creatures of myth and legend inhabit the world. A dark god...   [click here for more]
Chaosium  $26.95 $14.82

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Cthulhu Invictus Bestiae

Cthulhu Invictus Bestiae


Horror Roleplaying in Ancient Rome Here are new beasts and creatures for use with the Cthulhu Invictus setting of the Call of Cthulhu role-playing game. THIS IS A DOWNLOADABLE PRODUCT. Two 8.5x11" pages. ...   [click here for more]
Chaosium   FREE 

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Cthulhu Invictus Companion

Cthulhu Invictus Companion


The Mythos Threatens Ancient Rome AS ROME’S INFLUENCE SPREADS across the known world, so too spreads the worship of its gods. Roman leaders know that converting the people of conquered regions to the state religion makes them easier to control. But some gods have been worshipped longer than Rome has existed, and their supplicants won’t easily change allegiances. The...   [click here for more]
Chaosium  $12.95 $7.12

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Cthulhu Invictus Fabulae

Cthulhu Invictus Fabulae


Horror Roleplaying in Ancient Rome Here are scenario seeds for use with the Cthulhu Invictus setting of the Call of Cthulhu role-playing game. THIS IS A DOWNLOADABLE PRODUCT. One 8.5x11" page. ...   [click here for more]
Chaosium   FREE 

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Cthulhu Invictus Patrocinium

Cthulhu Invictus Patrocinium


Horror Roleplaying in Ancient Rome Notes on Roman Patronage for use with the Cthulhu Invictus setting of the Call of Cthulhu role-playing game. THIS IS A DOWNLOADABLE PRODUCT. One 8.5x11" page. ...   [click here for more]
Chaosium   FREE 

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Cthulhu Invictus Populus

Cthulhu Invictus Populus


Horror Roleplaying in Ancient Rome Non-player characters for use with the Cthulhu Invictus setting of the Call of Cthulhu role-playing game. THIS IS A DOWNLOADABLE PRODUCT. Two 8.5x11" pages. ...   [click here for more]
Chaosium   FREE 

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Cthulhu Live

Cthulhu Live


Cthulhu Live is a full evening's worth of fun every time it is played. There are no winners and no losers, only a group of friends having a good time. The participants are both actors and audience. Cthulhu Live is set in the universe of eldritch horror created by Howard Phillips Lovecraft - typically play alternates between horror and comedy, as the participants put different spins on...   [click here for more]
Chaosium  $16.95 $9.32

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Cthulhu Masters Tournament

Cthulhu Masters Tournament


Three Adventures From Gentler Times The CTHULHU MASTERS TOURNAMENT contains three scenarios presented during that year's GenCon. LORD AND BEAST: set in early WWII (June 1942) in the South Pacific, and interpreting the setting of William Golding's Lord of the Flies, beginning when the adult rescuers arrive to save British boys stranded by a plane crash on a desert isle. ELECTRIC...   [click here for more]
Chaosium  $16.95 $9.32

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Cthulhu Now

Cthulhu Now


CTHULHU NOW includes four roleplaying adventures, "The City in the Sea," The Killer Out of Space," The Evil Stars," and "Dreams Dark and Deadly." Background essays provide new skills and occupations, up-to-date cash-flow information, an elaborate firearms article (and a foldout illustrating contemporary firearms), active and passive night-vision equipment, a survey...   [click here for more]
Chaosium  $21.95 $12.07

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Cthulhu Rising

Cthulhu Rising


Call of Cthulhu Roleplaying in the 23rd Century It is the year 2271. The future is a dark and dangerous place. Outer space is the new frontier - humanity exploits the galaxy for its own ends. It is more than a hundred and fifty years since the United Earth Federation began to colonise the solar system and beyond. Millions of colonists — employees of either the Federation or...   [click here for more]
Chaosium  $17.00 $9.35

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Dark Designs

Dark Designs


Explore the occult in 1890s England. Particularly thorough background notes and unusual plots help keep the investigators on their toes. Streamlined investigator creation for the era: owning Gaslight is not necessary to use this book. ...   [click here for more]
Chaosium  $18.95 $10.42

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Dark Mirror

Dark Mirror


Gazing into the Dark Mirror This is the very worst wickedness, that we refuse to acknowledge the passionate evil that is in us. This makes us secret and rotten." -D. H. Lawrence CALL OF CTHULHU pits a dedicated group of investigators (controlled by the players) against a whole host of ills and evils. Sometimes the investigators are simply clearing up a localised problem where something has...   [click here for more]
Chaosium  $13.00 $7.15

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End Time

End Time


A Near-Future Setting for Call of Cthulhu This monograph explores humankind's future. We have left the Earth, traveling to other planets and the moons of our own solar system. Included here are notes on the Moon and mars colonies, advances in medicine and in the treatment of insanity, discussions of the hazards of space and in the living on other planets, and explorations of discoveries on...   [click here for more]
Chaosium  $13.95 $7.67

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Extrico Tabula

Extrico Tabula


The Second Cthulhu Invictus Companion As a rule, men worry more about what they can't see than about what they can.   —Julius Caesar Fear of the unknown is mankind's earliest fear, his most basic. What is out there in the dark? What hidden dangers lie within the forest, over those mountains, across that ocean? As the empire expanded, it encountered...   [click here for more]
Chaosium  $14.95 $8.22

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Farewell, My Sanity

Farewell, My Sanity


Adventures of the Guzman-Willent Detective Agency Enter the noir world with two adventures set in and around Los Angeles during the early 1920's. "Under the Boardwalk" concerns a teenage girl lost among the roller coasters and rum-runners in the amusement park city of Venice. The second scenario, "An Enchanted Evening," explores a mysterious concert on the paradisiacal isle of...   [click here for more]
Chaosium  $20.00 $11.00

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Fatal Experiments

Fatal Experiments


Fatal Experiments is a collection of three independent 1920's adventures for the Call of Cthulhu roleplaying game. Two of the three scenarios are suitable for both beginning and experienced players, making this book a perfect companion for first-time buyers of the Call of Cthulhu game system. The remaining adventure is unusually dangerous -- to be played only by experienced, follhardy...   [click here for more]
Chaosium  $18.95 $10.42

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Fearful Passages

Fearful Passages


Aircraft - Trains - Automobiles - Dirigibles - Diving Suits - Canal Boats - Armored Cars - Elephants - Siberian Sledges The golden age of travel occurred between 1880-1939. As traveling times shrank, destination became more important than journey, a notion now so conimon-sensical that we blink to think that the reverse was once truer. FEARFUL PASSAGES contains nine adventures set in...   [click here for more]
Chaosium  $18.95 $10.42

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First Book of Things

First Book of Things


Items, Spells, and Creatures for Call of Cthulhu This work provides a variety of creatures, technological items and spells for the Call of Cthulhu role playing game. The work follows the conventions presented in the rulebook in regards to creature statistics. While most of the creatures presented are associated with the Mythos, many are not. The new Mythos creatures provide the Keeper...   [click here for more]
Chaosium  $15.00 $8.25

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Five Go Mad in Egypt

Five Go Mad in Egypt


A survivor of the Great War, the Professor suffered a horrible shock a month ago — his father was killed, and he was injured and is slow to heal. He gathers a team to investigate the legendary Sphinx Tomb, seeking those with expertise in security or weapons, or interest in the occult or ancient religions. MISKATONIC UNIVERSITY LIBRARY ASSOCIATION monographs are longer works by one or...   [click here for more]
Chaosium  $25.95 $14.27

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Fragments of Fear

Fragments of Fear


The Second Cthulhu Companion This second Call of Cthulhu companion answers questions common to Call of Cthulhu games, and reveals ancient linguistic traces of the dread Cthulhu cult among various cultures. It then summarizes all Mythos spells printed in Shadows of Yog-Sothoth, The Asylum, the Cthulhu Companion, The Fungi From Yuggoth, Curse of the Chthonians, Trail of Tsathogghua,...   [click here for more]
Chaosium  $5.95 $3.27

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Gamemaster's Pack

Gamemaster's Pack


This essential supplement for the d20 edition of Call of Cthulhu contains the most important tables & rules synopses to make d20 Cthulhu game sessions easier & more enjoyable for the GM. Includes the 32 page adventure "The Lost temple of Yig", character sheets, NPC records, Monster Sheets, conversion notes between d20 Call of Cthulhu and the Classic Basic Roleplaying Call of Cthulhu,...   [click here for more]
Chaosium  $19.95 $10.97

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Gatsby and the Great Race

Gatsby and the Great Race


A Garden Party & The Running of the Great Race You know Julian Gatsby. He recently inherited the family home following the sad demise of his father. Julian is a free-spirited young man, in his mid-20s, and a new fan of the horse races. You arrive for a fabulous garden party and are shown to your room. Other guests arrive shortly after. In a few hours you will gather in the garden for an enjoyable...   [click here for more]
Chaosium  $20.00 $11.00

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H.P. Lovecraft's Arkham

H.P. Lovecraft's Arkham


Unveiling the Legend-Haunted City "Behind everything crouched the brooding, festering horror of the ancient town . . . the changeless, legend-haunted city of Arkham, with its clustering gambrel roofs that sway and sag over attics where witches hid from the King's men in the dark, olden days of the Province.   It was always a very bad time in Arkham . . . ."  ...   [click here for more]
Chaosium  $28.95 $15.92

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H.P. Lovecraft's Dreamlands

H.P. Lovecraft's Dreamlands


Roleplaying Beyond the Veil of Sleep We all dream . . .   For some, dreams can become reality. H.P. Lovecraft's Dreamlands provides everything needed for Call of Cthulhu or Cthulhu Dark Ages investigators to travel down the seven hundred steps, through the Gates of Deeper Slumber, and into the realm of dreams. Includes a travelogue of the Dreamlands, a huge...   [click here for more]
Chaosium  $34.95 $19.22

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H.P. Lovecraft's Dunwich

H.P. Lovecraft's Dunwich


Return to the Forgotten Village For classic Call of Cthulhu and d20 Cthulhu. Dunwich is a small village located along the Miskatonic, upriver from Arkham. Until 1806, Dunwich was a thriving community, boasting many mills and the powerful Whateley family. Those among the Whateleys came to know dark secrets about the world, and they fell into the worship of unwholesome creatures from...   [click here for more]
Chaosium  $25.95 $14.27

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Halloween Horror

Halloween Horror


Three Halloween Adventures Chaosium periodically hosts contests on our web site. The adventures presented here were chosen from among the best submissions from our 2005 Halloween Adventure contest. Eyes That Should Not See BY JIM LYNCH. The Trepanation Proponents of America (TPA) is a small organization, run by its founder — John Croft. Croft is an intelligent, calm man who...   [click here for more]
Chaosium  $12.95 $7.12

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