The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Splash Damage (Developer) (1 member)
- Sports (Genre) (266 members)
- Sports Champions (Series) (2 members)
- Sproing Interactive Media (Developer) (2 members)
- Sprout Games (Developer) (1 member)
- Square Enix (Developer) (9 members)
- Square Enix (Publisher) (40 members)
- Stainless Games (Developer) (5 members)
- Stainless Studios (Developer) (1 member)
- Star Ocean (Series) (3 members)
- Starbreeze Studios (Developer) (5 members)
- Start the Party! (Series) (2 members)
- Stealth (Genre) (32 members)
- Stealth Inc. (Series) (2 members)
- Stickmen Studios (Developer) (1 member)
- Stickmen Studios (Publisher) (1 member)
- Sting Entertainment (Developer) (2 members)
- StormBASIC (Developer) (1 member)
- StormBASIC (Publisher) (1 member)
- Straight Right (Developer) (1 member)
- Straight Right (Publisher) (1 member)
- Strange Loop Games (Developer) (1 member)
- Strategy (Genre) (60 members)
- Strawdog Studios (Developer) (1 member)
- Street Fighter (Series) (5 members)
- Strict rendering mode: On (Config) (13 members)
- Studio Saizensen (Developer) (1 member)
- Sucker Punch Productions (Developer) (4 members)
- Sullivan Bluth Interactive (Developer) (1 member)
- Sumo Digital (Developer) (12 members)
- Sunsoft (Publisher) (1 member)
- SuperBot Entertainment (Developer) (1 member)
- SuperVillain Studios (Developer) (2 members)
- Super Robot Wars (Series) (7 members)
- Super X Studios (Developer) (1 member)
- Superbike World Championship (Series) (3 members)
- Superflat Games (Developer) (1 member)
- Supermassive Games (Developer) (8 members)
- Supersonic Software (Developer) (1 member)
- Survival (Genre) (4 members)
- Survival horror (Genre) (37 members)
- Swordfish Studios (Developer) (1 member)
- Syberia (Series) (2 members)
- Synetic (Developer) (2 members)
- SystemSoft Alpha (Developer) (13 members)
- SystemSoft Alpha (Publisher) (13 members)
- System 3 (Developer) (1 member)
- System 3 (Publisher) (6 members)
- System Prisma (Developer) (1 member)
- THQ (Publisher) (55 members)