| System (Setting) | Publications | Articles |
|---|---|---|
 R'lyehwatch | 1 | 8 |
| Raiders of R'lyeh | 4 | 34 |
 The Rats in the Walls | 1 | 1 |
| Reanimator | 2 | 2 |
| Recall of Cthulhu | 1 | 1 |
| Red Bat | 1 | 0 |
| Ressurection of the King | 1 | 0 |
| Rise of Cthulhu | 2 | 2 |
| Rise of the Elders | 1 | 1 |
| Risus | 3 | 3 |
| Rites of Cthulhu | 1 | 1 |
| Ritual | 1 | 1 |
| Rogue Handler | 2 | 0 |
| ROLF! | 2 | 1 |
| Roll for Great Old Ones | 1 | 1 |
| Runequest | 1 | 0 |