Blizzard Entertainment został założony przez Michaela Morhaime, Allena Adham i Franka Pearce jako Silicon & Synapse w lutym 1991r. Początkowo firma skupiła się na tworzeniu portów gier innych wydawców. Produkcja takich tytułów jak Diablo, Warcraft, StarCraft przyniosły ogromne rzesze fanów. Ich gry dostawały wiele nagród m.in. za grę roku czy najlepszy tryb mulitiplayer. Na początku grudnia 2007 r. ogłoszono fuzję koncernu Vivendi Games, którego częścią jest Blizzard Entertainment z Activision, której rezultatem jest Activision Blizzard. Nie ma to jednak oznaczać zmian w prowadzeniu projektów czy pracownikach Blizzarda. Oryginalne info firmy:

Blizzard Entertainment is a premier developer and publisher of entertainment software. After establishing the Blizzard Entertainment label in 1994, the company quickly became one of the most popular and well-respected makers of computer games. By focusing on creating well-designed, highly enjoyable entertainment experiences, Blizzard Entertainment has maintained an unparalleled reputation for quality since its inception.

Blizzard's Entertainment track record of back-to-back #1-selling games spans more than a decade, and with blockbuster hits such as World of Warcraft, Warcraft III: Reign of Chaos, Diablo II, and StarCraft, the company has earned several consecutive Game of the Year awards. In addition, Blizzard Entertainment's online-game service, Battle.net®, is one of the largest in the world, with millions of active users.

The high-quality products based on Blizzard Entertainment's games have also proven popular and garnered much critical acclaim. These products include action figures, novels, manga, board games, pen-and-paper role-playing games, apparel, and the World of Warcraft Trading Card Game, which is a bestseller in its category. Extending the reach of its game universes even further, Blizzard Entertainment is currently at work with Legendary Pictures, the studio behind the feature films Batman Begins, Superman Returns, and 300, on a live-action Warcraft movie.