Cthulhu Companion
| Publisher | Chaosium, Inc. |
| Editor | Sandy Petersen |
| Consulting Editor | Lynn Willis |
| Artist | Chris Marrinan, Gene Day, Lisa A. Free, Tom Sullivan |
| Format | Soft cover |
| Language | English |
| Location | Albany, CA |
| Copyright | 1983 |
| Pages / Font | 64 pages |
| Catalog Number | Chaosium production 2304 |
| Notes | A supplement for Call of Cthulhu roleplaying game A sourcebook, rules additions, scenarios |
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