Phase Three of the Marvel Cinematic Universe (MCU) is a group of American superhero films produced by Marvel Studios based on characters that appear in publications by Marvel Comics. The phase began in 2016 with the release of Captain America: Civil War and concluded in 2019 with the release of Spider-Man: Far From Home. It includes the crossover films Avengers: Infinity War, released in 2018, and its sequel Avengers: Endgame, released in 2019. Kevin Feige produced every film in the phase, alongside Amy Pascal for Spider-Man: Homecoming and Spider-Man: Far From Home, and Stephen Broussard for Ant-Man and the Wasp. The eleven films of the phase grossed over US$13.5 billion at the global box office and received generally positive critical and public response. Upon release, Avengers: Endgame became the highest-grossing film of all time.

The Marvel Cinematic Universe (MCU) is an American media franchise and shared universe centered on a series of superhero films produced by Marvel Studios. The films are based on characters that appear in American comic books published by Marvel Comics. The franchise also includes television series, short films, digital series, and literature. The shared universe, much like the original Marvel Universe in comic books, was established by crossing over common plot elements, settings, cast, and characters.