BioShock Infinite is a first-person shooter video game developed by Irrational Games and published by 2K Games. The third installment in the BioShock series, Infinite was released worldwide for the PlayStation 3, Windows, Xbox 360, and OS X platforms in 2013. The game is set in the year 1912 and follows its protagonist, Booker DeWitt, who is sent to the airborne city of Columbia to retrieve a young woman held captive, named Elizabeth. Booker rescues Elizabeth and the two become involved in a class war between the nativist Founders that rule Columbia and the rebel Vox Populi representing the city's underclass. Elizabeth possesses the ability to manipulate "Tears" in the space-time continuum that ravage Columbia, and Booker and Elizabeth discover she is central to the city's dark secrets. The player controls Booker Dewitt throughout the game, fighting enemies and scavenging supplies, while the computer-controlled Elizabeth provides assistance.

After the 2007 release of BioShock, Irrational Games and creative director Ken Levine initially wanted to do something different than a sequel. However, they later renegotiated with 2K to work on another BioShock game. Irrational based the game's setting on historical events at the turn of the 20th century, such as the 1893 World's Columbian Exposition, and based the story on the concept of American exceptionalism, while also incorporating influences from more recent events at the time such as the 2011 Occupy movement. The relationship of Book and Elizabeth became central to the story, with the team working to make Elizabeth feel like a real character rather than a computer-controlled sidekick.

Development took five years to make and involved hundreds of employees at Irrational, in addition to support studios. Development was troubled, with Levine's management style resulting in wasted work and missed deadlines. Outside help was brought in to make sure the game shipped. BioShock Infinite was supported post-launch with downloadable content, including the story expansion Burial at Sea, which links Infinite's story to that of the original BioShock game.

BioShock Infinite received critical acclaim, with praise particularly directed at its story, setting, and visual art design. It is often regarded as one of the best video games of the year, of the seventh generation of consoles, and one of the greatest video games ever made. It has sold more than 11 million copies worldwide. Infinite was re-released on PlayStation 4, Xbox One, and Nintendo Switch as part of the remaster compilation BioShock: The Collection.