Allen Hammack is an American game designer and editor, best known for his work on several classic TSR Dungeons & Dragons modules.
Hammack grew up as a wargaming enthusiast in Alabama. He became involved with Dungeons & Dragons during the 1970s, where he often played the role of a Dungeon Master, crafting the worlds and events of his home campaigns. While attending Gen Con XI, Hammack met TSR founder Gary Gygax, who hired him as a games editor. Hammack went on to develop and edit multiple TSR role-playing products, including many books, guides, and peripherals. Hammack was the primary designer on several published D&D modules, including A3 Assault on the Aerie of the Slave Lords and C2 Ghost Tower of Inverness. Hammack worked for TSR until 1983, when he left to open a gaming store in his home state.