BlizzCon is a video game convention held by Blizzard Entertainment to promote its major franchises Warcraft, StarCraft, Diablo, Hearthstone, Heroes of the Storm and Overwatch. Since October 2005, it has been held at the Anaheim Convention Center in Anaheim, California. The convention features game-related announcements, previews of upcoming Blizzard Entertainment games and content, Q&A sessions and panels, costume contests and playable versions of various Blizzard games. The closing night has featured concerts by The Offspring, Tenacious D, Foo Fighters, Ozzy Osbourne, Blink-182, Metallica, Linkin Park, “Weird Al” Yankovic, and Muse.

A similar event was the Blizzard Worldwide Invitational, held outside the U.S. from 2004-2008.