StarCraft II: Legacy of the Void is a planned stand alone expansion pack to the military science fiction real-time strategy game StarCraft II: Wings of Liberty, and the third part of the StarCraft II trilogy developed by Blizzard Entertainment.

The expansion will include additional units and multiplayer changes from Wings of Liberty, as well as a continuing campaign focusing on the Protoss species. The campaign will focus on Artanis as its main character. Blizzard launched invite-only beta testing of the game on March 31, 2015. 

The pre-order of the game was announced and made available for purchase on Battle.net and major game retailers on July 15, 2015. Pordering the game grants immediate access to the multiplayer beta and a set of 3 prologue missions titled Whispers of Oblivion, which will also be available to all players at an undetermined time prior to the launch of Legacy of the Void