The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Snowblind Studios (Developer) (1 member)
- Snowboarding (Genre) (2 members)
- Social simulation (Genre) (2 members)
- Soedesco (Publisher) (1 member)
- Soldner-X (Series) (2 members)
- Sonic Team (Developer) (8 members)
- Sonic Team USA (Developer) (1 member)
- Sonic the Hedgehog (Series) (12 members)
- Sony Computer Entertainment (Publisher) (249 members)
- Sony Online Entertainment (Developer) (4 members)
- Sony Online Entertainment (Publisher) (24 members)
- SoulCalibur (Series) (4 members)
- Souls (Series) (3 members)
- SouthPeak Games (Publisher) (3 members)
- South Park (Series) (1 member)
- Southend Interactive (Developer) (3 members)
- Space Monkey International (Developer) (1 member)
- Spark Unlimited (Developer) (4 members)
- Sparkworkz (Developer) (1 member)
- Sparpweed (Publisher) (1 member)
- Spearhead Games (Developer) (1 member)
- Spelunker (Series) (2 members)
- Spicy Horse (Developer) (1 member)
- Spider-Man (Series) (6 members)
- Spiders (Developer) (4 members)
- Spike (Developer) (4 members)
- Spike Chunsoft (Developer) (3 members)
- Spike Chunsoft (Publisher) (6 members)
- SpinVector (Developer) (1 member)
- SpinVector (Publisher) (1 member)
- 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)