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- Gale Force Nine - Role-playing games and accessories
- Galileo Games Inc - Role-playing games
- Gallant Hand's Gamer Gear - Games accessories
- Game Codex - Role-playing games, miniatures, and dice
- Game Designers' Guild - Game Designers' Guild (SAZ) Newsletter
- Game Designers' Workshop - Wargames and role-playing games (out of business; see Far Future Enterprises)
- Game Research/Design - Wargames
- Games Research Inc - Board wargames
- Game Figures Inc - Miniatures
- Game Masters Associated - Role-playing accessories
- Game Monkey Press - Role-playing games
- Game Systems, Inc - Play-by-mail games
- Gamealogical Institute - Dice games, board games, game exploration
- GAMeBIT - Card and board games
- The Gamers - Wargames
- Gamer Nation Studios - Card and board games
- Games Publications Group - Wargames
- Games Workshop - Miniature games and board games
- Gamescience Inc. - Dice and role-playing accessories
- Gamesmith, LLC - Board and card games
- Gamesmiths - Board games
- Gametime - Board games
- Gamewright - Board and card games
- Gammazon - Wargames
- Ganesha Games- Wargames and role-playing games
- Garden Games Limited - Garden Games and Outdoor Toys
- Gaslight Press - Role-playing accessories
- Gen42 Games - Board games
- GeoHex - Miniatures terrain
- Georgo Industries - Miniatures accessories
- GhazPORK Industrial - Collector card games
- Ghost Miniatures - Miniatures
- GHQ Models - Miniatures
- Gibsons Games - Board games
- GiftTRAP - Board games
- Gigamic - Board games
- GMT Games - Board, card, and role-playing games
- Goodman Games - Role-playing games
- Goldie Marketing - Miniatures
- Gorilla Games - Role-playing games
- Grand Prix International - For-hire shop that produces games
- Great Escape Games - Miniatures rules
- Great River Games - Role-playing games
- Great White Games - Collector card games and card games
- Green Knight Publishing - Role-playing games
- Green Ronin Publishing - Role-playing accessories
- Greenfield Hobby Distributors - Miniatures and miniatures rules
- Grenadier Miniatures - Miniatures and board games
- Grenier Games - Wargames
- Grey Ghost Press, Inc. - Role-playing games
- Griffin Games - Role-playing games
- Grim Reaper Casting - Miniatures
- Grimoire Games - Role-playing games
- Gripping Beast - Miniatures
- Ground Zero Games - Miniatures and wargames
- Group Three Games - Wargames
- GT2 Fun & Games - Board games
- Guardians of Order - Role-playing games
- Guidon Games - Board games and wargames
- Guardians of Order Inc - Role-playing games
- Guild of Blades Publishing - Board and role-playing games
- Guildhouse Games - Role-playing accessories
- Gypsy Knights Games - Role-playing accessories
Read more about this topic: List Of Game Manufacturers