| System (Setting) | Publications | Articles |
|---|---|---|
| Talisman | 0 | 0 |
| Teachers and Tentacles | 1 | 1 |
| TekHL | 1 | 0 |
| Terror in the Theatre | 1 | 1 |
| Tides of Madness | 1 | 1 |
| Tiny Cthulhu | 1 | 0 |
| Titas of Arkham | 1 | 0 |
| Tower of Madness | 3 | 3 |
| Towers of Am'harb | 1 | 1 |
| Trail of Cthulhu | 126 | 305 |
| Traveller (Chthonian Stars) | 1 | 19 |
| Traveller | 1 | 1 |
| tremulus | 10 | 3 |
| True 20 | 1 | 0 |
| Tunnels and Trolls | 1 | 1 |
| Two Rooms and a Boom | 1 | 1 |