 Ripples from Carcosa - Three Struggles Against Hastur Across Time & Space (Feb 2005) |  Rise of the Dead: Part 1 - The Arrival (2008) |  Rise of the Dead: Part 2 - The Raid (2010) |  RMS Titanic: The Millionaire’s Special (Abr 2012) |  Rol & Rock #5 (Feb 1998) |
 Rol Gratis Volumen I (Jun 2015) |  Rol Gratis: Volumen 3 (Jun 2017) |  Rough Magicks (Nov 2009) |  Le Royaume des Ombres (Nov 2000) |  RPG Magazine (Sep 2002) |
 Las ruinas de Hindenburg (2021) |  S. Petersen's Field Guide to Creatures of the Dreamlands (1989) |  S. Petersen's Field Guide to Cthulhu Monsters (1988) |  Sacraments of Evil (Nov 1993) |  Sandy Petersen's Cthulhu Mythos (2018) |
 Sandy Petersen's Field Guide to Lovecraftian Horrors (2015) |  Sangre de inocentes (Jun 2017) |  Scritch Scratch (Jun 2018) |  Search and (be) rescue(d) (Jul 2020) |  Secretos (Mar 2001) |
 Secretos de Arkham (1993) |  Secretos de Edimburgo (May 2020) |  Secretos de Nueva York (2007) |  Secrets (1997) |  Les Secrets de New York (Dic 2008) |