Group
- Something Witty and Clever1
- Somos Rol2
- Somos Rol/Chaosium/Nosolorol1
- Somos Rol/Other Selves1
- Son of Oak7
- Sons of Tekas8
- Sons of the Singularity LLC8
- Sony Online Entertainment13
- Sophisticated Cerberus Games18
- Sophisticated Cerberus Games, LLC6
- Souderton Area School District2
- Soultaker Studios1
- Sour Lemon Games13
- South East London Wargames Group2
- Southern Indiana by Night4
- Southland Gamers3
- Southwest Indiana Gaming Group2
- Sovereign Press21
- Sovereign Press, Inc.4
- Sovranti77