BioShock Infinite is a first-person shooter video game developed by Irrational Games, and published by 2K Games. Previously known as "Project Icarus" in development, it was released worldwide on the Microsoft Windows, PlayStation 3, and Xbox 360 platforms on March 26, 2013. An Aspyr port to Mac OS X was released on August 29, 2013. BioShock Infinite is the third installment in the BioShock series, and though it is not part of the storyline of previous BioShock games, it does feature similar gameplay concepts and themes. The game's concept and setting were developed by Irrational's creative lead, Ken Levine, who took inspiration from both historical events at the turn of the 20th century, as well as more recent ones at the time such as the "Occupy" protests.

Set in 1912 during the growth of American exceptionalism, the game has protagonist, former Pinkerton agent Booker DeWitt, sent to the floating air-city of Columbia to find a young woman, Elizabeth, who has been held captive there for most of her life. Though Booker rescues Elizabeth, the two are pursued by the city's warring factions: the nativist and elite Founders that strive to keep the city for pure Americans, and the Vox Populi, rebels representing the common people. Booker finds Elizabeth to be central to this conflict, and learns that she possesses strange powers to manipulate rifts in the space-time continuum that ravage Columbia.

The player controls Booker throughout the game, eventually working with the AI-controlled Elizabeth. Like previous BioShock games, the player uses a combination of weapons, gear, and psychokinetic powers granted through vigors. Elizabeth's powers can also be used to help fight hostile forces. In contrast to the limited spaces of the underwater city of Rapture, the open-air city of Columbia provides for more combat challenges, including combat that takes place aboard the city's Skyline rollercoaster-like rail system. The game also features an optional "1999 Mode", harking back to games like System Shock 2 where decisions made by the player have a more permanent impact on the game.