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Cults of Cthulhu - PDF

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Cthulhu Calls!

At long last, the intricacies of the nefarious Cthulhu cult are revealed!

Chaosium Unveiled: Inside Cults of Cthulhu

Watch the unveiling video to see the book for yourself. Remember that you get the PDF when getting the physical copy.

What’s Inside?

Cults of Cthulhu gives you the rules to inject fully-realized and unique Cthulhu cults directly into your campaigns, and create your own antagonists. The tome also contains three scenarios featuring insidious Cthulhu cults spanning from the Gaslight era to the modern day.

Cult Leaders

Secrets of the Cthulhu Cults

Secrets of the Cthulhu Cults

A detailed history of the various cults of Cthulhu, spanning from the Victorian Era all the way to the modern day - perfect for any era of Call of Cthulhu play. The book also includes five distinct cults, ready for use in your games.

Conflict Rises

Design Your Own Cult

Creating a Cult

Detailed guidance on creating your own bespoke Cthulhu cult. Included is a ‘Cults Worksheet’ to track the history of your cult, their inspirations, resources, locations, and much more.

Example Cult

A Suite of Scenarios

Three scenarios concerning Cthulhu cults across time.

Loki's Gift

Loki's Gift

London, 1896. A tragedy in an upper-class family sees the investigators employed to look into the truth behind a beloved son’s demise.

Angel's Thirst

Angel's Thirst

Los Ángeles, 1923. The search for a missing taxi driver kicks off an investigation tainted by the criminal underworld, and perhaps something darker.

A God's Dream

A God's Dream

Chicago, 2021. When a former colleague is found frozen to death and clutching a mysterious artifact, the investigators begin to question the nature of their free will.

Downloads for this Product

Keeper Reference Booklet
Keeper Map Pack
Player Handouts and Maps
Plain Text Handouts
NPC Portraits

Mature Readers Warning Notice

Watch Live Play: Cults of Cthulhu

Curious about the scenarios? Watch the Live Play on the Stream of Chaos

What The Critics Say

  • "There are 370 pages in Cults of Cthulhu and the detail and information packed into them really is extraordinary... There is absolutely no question in my mind that Cults of Cthulhu is an essential addition to any Call of Cthulhu Keeper or Investigator’s bookshelf, as well as that of anyone with an interest in the Cthulhu Mythos generally. Get a copy as soon as you can."

    — GameOnAUS, A Cult Above - Cults of Cthulhu RPG Sourcebook Reviewed.

  • "This is a very impressive book, and you will certainly get value for money."

    — M.T. Black, Twitter Review.

  • "A surprisingly detailed sourcebook to the point where its appeal goes beyond the RPG elements and it would be interesting reading for any fan of the Cthulhu Mythos—making it an appealing gift for the Lovecraftian Horror fan in your life."

    — Royce Wilson, The GOA 2021 Table-Top RPG Gift Guide.

  • "A compendious and superlatively produced supplement for Call of Cthulhu, devoted to the cults devoting themselves and their sanity to Big Squidface, across the ages and the continents. If there's one book needed for Keepers to put awe and terror back into their Cthulhu-focused campaigns, it's this one... [a] fabulous piece of work that belongs on the shelf of every CoC gamer, and probably a great many others besides - it's that useful, and that good."

    — Paul StJohn Mackintosh, RPGNet, Review of Cults of Cthulhu.

  • "An important part of the Cthulhu Mythos mystery ecology... a fantastic book for Keepers"

    — Charles Dunwoody, EN World, A Review of Cults of Cthulhu.

  • "A robust book that offers a lot for the gaming table."

    — British Fantasy Society, Cults of Cthulhu by Chaosium. RPG review.

  • "An excellent supplement for those looking to dive into the history of the cult and includes three very solid adventures focusing on a trio of very different groups of worshipers of the Great Old One."

    — The Gaming Gang, Cults of Cthulhu Reviewed.

  • "One of the most substantive supplements released for the game"

    — Refereeing & Reflection, Call of the Cults.

  • "Cults of Cthulhu takes the Keeper back to Lovecraft’s The Call of Cthulhu to look at some of the roleplaying game’s fundamentals and inspirations with fresh eyes. The result is an excellent examination of both cults and Cthulhu, supporting the Keeper with advice and the means to create her own cults and cultists, as well as backing everything up with examples and scenarios."

    — Reviews from R'lyeh, Faiths of Fear.

  • "Cthulhu is gonna be the main draw for a game called Call of "Cthulhu, so why not have some humans doing bad things for him? This book is a solid resource that, even if I just wanted some quick adventures and handouts, is well worth the price of admission. 100%."

    — Edward Alan Kabara, RPGNet Review of Cults of Cthulhu.

  • "Cults of Cthulhu is a book I didn’t know I wanted or even needed, but now that I’ve had it in my possession, and read it, I don’t think I’ll ever let it go. Cults of Cthulhu is one of the most entertaining RPG sourcebooks I’ve ever read. HIGHLY RECOMMENDED!"

    — EuroCultAV, Tabletop Review – A Time to Harvest/Cults of Cthulhu – Chaosium.

  • "One of the most important books any game master can have for any system they are running."

    — Game On!, Every Game Master NEEDS This Book - Cults Of Cthulhu (Youtube).

  • “Really impressed by the quality, imagination, and thoughtfulness of this supplement... My only real complaint is that it has taken 40 years for Chaosium to start putting out this kind of book."

    — Taskerland, REVIEW: Cults of Cthulhu.

  • “Cults of Cthulhu is a well-crafted, thoughtful, and very useful guide to adding Cthulhu cults to your games."


  • "Any Cthulhu fan would have to be crazy not to get it... Let’s face it; cults are fun, and whether yours worships The Goat with a Thousand Young, The Crawling Chaos, or He who Shall not be Named, this book contains the means to make it realistic, dynamic and memorable. Recommended.”

    — Stygian Muse, Cults of Cthulhu: Humanising Cosmic Horror..

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Year Released:
Call of Cthulhu 7th Edition
Full Color PDF
Page Count:
Chris Lackey, Mike Mason
Cover Artist:
Loïc Muzy
Interior Artists:
Alberto Bontempi, Thomas Brown, Irene Cano, Kristina Carroll, Caleb Cleveland, Stephen Cornu, Kring Demetrio, Emanuele Desiati, Michael Ellis, Andrey Fetisov, Doruk Golcu, Nicholas Grey, Patrik Hell, Kali Houisse, Pat Loboyko, Sam Lofti, Ernest Mason
Interior Artists (Continued):
Loïc Muzy, Aleks Shcherbakov, John Sumrow, Johnathan Torres, Arrigo Verderosa
Cartography and Handouts:
Matt Ryan
Nicholas Nacario
  • Full Star Full Star Full Star Full Star Empty Star 4
    Should be 5 stars, but that file size...

    Posted by Brian Sandall on 10th Nov 2022

    Beautiful PDF that clocks in at 118 MB for 370 pages. Compare that to the 449-page Keeper Rulebook that can be had for only 27.1 MB and you see my main complaint - this goes for all of the extras, too, like the 18 page keeper maps that for some reason is 76.4 MB. Other than that, very happy with this product.

  • Full Star Full Star Full Star Full Star Full Star 5
    Ring Side Report- Cults of Cthulhu

    Posted by Edward on 8th Nov 2022

    Originally posted at, a new idea every day! Product- Cults of Cthulhu System- Call of Cthulhu 7th Ed Producer- Chaosium Price- $25 here TL; DR- Solid Book of bad guys, set ups, and tools 100% Basics- Ia! Ia! Cults of Cthulhu gives you… exactly what it says! This book is a book of four different cults, adventures to go against each cult, and tools to build your own cthulhu cult. Mechanics or Crunch- This book is VERY much a Keeper’s book and not a players’ book, and that's ok. This book has new monsters and stats for them, variant spells, and tips for building your own cult. I am honestly impressed by the depth of ideas for building a cult. I play too many fantasy games where the idea of how a cult is financed doesn't come up. But here, how the money happens is a very important way to build your cult. Even optional crunch for Pulp Cthulhu is presented! Players will find nothing in this book, but Call of Cthulhu doesn't really ever give players much more beyond the basic investigator book. The crunch doesn't disappoint in this one. 5/5 Theme or Fluff- Again, this is a Keeper book, but built in a fun, informative way to help the Keeper build a world. Each of the four presented cults have real depth and personality with individual people and their goals presented. My one minor negative is like most Cthulhu books, you really only get the 1920s as a playground. It’s the most popular time for Call of Cthulhu, so I understand why, but I do seriously appreciate the one modern cult that is presented here. Also, adventures! There are four adventures against these four cults. So even if you need a one shot, this book has you covered. 5/5 Execution- I don’t think Chaosium has ever disappointed me. Hyperlinks, solid handouts, easy reading, separate files, pictures of monsters, and everything else makes this the whole nine yards. Its 25 bucks as a PDF, which is a decent chunk for a PDF, but even if you just used this for four one-shots, that brings the price down to manageable levels of any other market adventure for CoC. And it seems that Chaosium is listening and , while I love them, the handwritten notes are hard to read, Chaosium is making just nice plain text ones as well. My one complaint is I want pregens for each of the adventures, but that is just begging for more on an already solid product. 5/5 Summary- Cthulhu is gonna be the main draw for a game called Call of Cthulhu, so why not have some humans doing bad things for him? This book is a solid resource that, even if I just wanted some quick adventures and handouts, is well worth the price of admission. If you want to build your own cults, then this is the book you might want to check out as well. NOW DO YOG! 100%

  • Full Star Full Star Full Star Full Star Full Star 5
    Cults of Cthulhu for CoC 7E

    Posted by Shane Bauer on 23rd Mar 2022

    This is a terrific CoC supplement, one of the best last year. One thing that's always been missing from the game was, "What do all these cults do when they're not getting shot at by the Investigators?" Asked and answered! I can't recommend it highly enough and can't wait until the print version is out.

  • Full Star Full Star Full Star Full Star Full Star 5
    Superbly done work.

    Posted by Scott Edward Nash on 13th Mar 2022

    I was not sure if this book would be helpful to me, but I was very pleasantly surprised with the content and quality of the information that was put into it. It is a very interesting read and well thought out. I am now anxiously awaiting the physical copy to be available. If you have any interest at all in exploring the ideas and structures of cults or want to create your own - this is the book for you. Really well done and a great example of the love Chaosium has for the Cthulhu mythos.

  • Full Star Full Star Full Star Full Star Full Star 5
    Well Written

    Posted by David LaSelle on 30th Oct 2021

    Grade A Book. I would recommend it to anyone