Peter D. Adkison is an American game designer and businessman best known as the founder of Wizards of the Coast. He served as the company's chief executive officer from 1993 to 2001. Adkison is the current owner of Gen Con, a major yearly game convention in the Midwest.

During Adkison's tenure, Wizards of the Coast rose to the status of a major publisher in the hobby game industry. Wizards achieved success with its creation of Magic: the Gathering, which started the collectible card game genre. It also distributed the Pokémon trading cards, and later acquired TSR, publisher of the Dungeons & Dragons role-playing game, releasing a successful new edition.

In 1999, Adkison sold Wizards of the Coast to Hasbro, remaining with the company until January 2001.

As a longtime fan of role-playing games (RPGs), Adkison has become an advocate for indie RPGs. His own game design work includes The Primal Order, a "capstone system" for use with any of a number of different role-playing games.

As a child, Adkison enjoyed playing strategy games and war games. In 1978, he was exposed to Dungeons & Dragons, which "blew [him] away." His friend, Terry Campbell, suggested the idea of starting a game company to Adkison and his friends using the name "Wizards of the Coast", taken from a guild of which one of their player characters was a member.

In the early 1980s, Adkison self-published a wargame to be used with fantasy role-playing games titled Castles & Conquest, utilizing the "Wizards of the Coast" name as a brand. In 1981, he created a Dungeons & Dragons campaign titled Chaldea, which he continues to run today.

As of 2002, Adkison was running two Dungeons & Dragons campaigns and playing in three. He enjoys a wide variety of games including Magic: the Gathering, Twitch, The Settlers of Catan, Robo Rally, Call of Cthulhu, Vampire: The Masquerade, and the Legend of the Five Rings Roleplaying Game.

While working at Hidden City Games, his public biography from 2005 claimed that he was married to Melissa Reis Adkison.