A military science fiction real-time strategy video game developed and released by Blizzard Entertainment for Microsoft Windows and Mac OS X. A sequel to the award-winning 1998 video game StarCraft and its expansion set released by Blizzard, the game was released worldwide on July 27, 2010. It is split into three installments: the base game with the subtitle Wings of Liberty, and two expansion packs, Heart of the Swarm and Legacy of the Void.

The game revolves around three species: the Terrans, human exiles from Earth; the Zerg, a super-species of assimilated life forms; and the Protoss, a technologically advanced species with vast mental powers. Wings of Liberty focuses on the Terrans, while the expansions Heart of the Swarm and Legacy of the Void will focus on the Zerg and Protoss, respectively. The game is set four years after the events of 1998's StarCraft: Brood War, and follows the exploits of Jim Raynor as he leads an insurgent group against the autocratic Terran Dominion. The game includes both new and returning characters and locations from the original game.

The game was met with very positive reviews from critics, receiving an aggregated score of 93% from Metacritic. Similar to its predecessor, StarCraft II was praised for its engaging gameplay, as well as its introduction of new features and improved storytelling. The game was criticised for lacking features that existed in the original StarCraft game including LAN play and the ability to switch between multiplayer regions. At the time of its release, Starcraft II became the fastest selling real-time strategy game of all time, with over three million copies sold worldwide in the first month.

StarCraft II features the return of the three species from the original game: Protoss, Terran, and Zerg. In the Terran campaign, the original StarCraft briefing room is replaced with an interactive version of the battlecruiser Hyperion, with Jim Raynor, now a bitter and hard-drinking mercenary captain, as the central character. In a departure from previous Blizzard games, the campaign is non-linear, with Raynor taking jobs for money and using that money to buy additional units and upgrades. Although each playthrough will vary, the end result remains consistent, keeping the storyline linear. Vice President Rob Pardo stressed that each campaign will function very differently. The Terran campaign, Wings of Liberty, places players in a mercenary-style campaign, as Terran rebel Jim Raynor performs missions for cash. The second release, the Zerg campaign Heart of the Swarm, has role-playing elements. The player can level up the Queen of Blades, Kerrigan, throughout the missions. In the last expansion, the Protoss campaign Legacy of the Void, the dark templar Zeratul employed diplomacy between Protoss tribes to acquire units and technologies for each mission. Wings of Liberty has 29 playable campaign missions, but only 26 of them are playable in a single playthrough since three missions are choice-related alternates. There is one secret mission named "Piercing the Shroud", which can be unlocked on the "Media Blitz" mission, by destroying a Science Facility in a corner of the map.

Several unique missions are included in the Wings of Liberty campaign. In one level, lava floods the battlefield every five minutes, forcing the player to move their units to high ground or watch them get destroyed. In another mission, enemy units will only attack the player at night. Finally, in one mission, the player tries to influence the tide of an AI-controlled battle with only a single unit, a Spectre. The single player missions are highly customizable and are featured in the StarCraft II Community Zone. Between missions, players can choose units, buildings, and upgrades that are not available in the multiplayer missions.