Overwatch is a team-based multiplayer first-person shooter developed and published by Blizzard Entertainment. Described as a "hero shooter", Overwatch assigns players into two teams of six, with each player selecting from a large roster of characters, known as "heroes", with unique abilities. Teams work to complete map-specific objectives within a limited period of time. Blizzard has added new characters, maps, and game modes post-release, all free of charge, with the only additional cost to players being optional loot boxes to purchase cosmetic items. It was released for PlayStation 4, Xbox One, and Windows in May 2016, and Nintendo Switch in October 2019.

Overwatch is Blizzard's fourth major franchise and came about following the 2014 cancellation of a massively multiplayer online role-playing game, Titan. A portion of the Titan team were inspired by the success of team-based first-person shooters like Team Fortress 2 and the popularity of multiplayer online battle arena games, creating a hero-based shooter which emphasized teamwork. Some elements of Overwatch borrow concepts from the canceled Titan project.