The Marvel Cinematic Universe (MCU) is a franchise and fictional universe featuring a series of superhero films independently produced by Marvel Studios and based on characters from Marvel Comics, while remaining independent of the comic book universe. The franchise extends beyond the actual feature films, it also includes short films, tie-in comic books, television series and web series. In addition, compilation albums are released featuring the music featured in the films and series. Like the original Marvel comic book universe, the MCU's releases tie together basic plot elements, story locations, cast, and characters.

The universe is divided into four phases so far. The first film in the MCU was Iron Man (2008), with which the first phase began. This was completed in 2012 with Marvel's The Avengers, before the second phase began with Iron Man 3 (2013). This consisted of six films and concluded in July 2015 with Ant-Man. In 2016, the third phase began with The First Avenger: Civil War, comprising eleven films in total, ending in 2019 with Spider-Man: Far From Home. In 2011, The Counselor, the first short film in the universe, was released. In September 2013, the MCU experienced an expansion into television with the ABC series Marvel's Agents of S.H.I.E.L.D.. In 2015, Marvel's Agent Carter and the Netflix series Marvel's Daredevil and Marvel's Jessica Jones followed on ABC. In 2016, Marvel's Luke Cage also appeared on Netflix and was followed by the ABC web series Marvel's Agents of S.H.I.E.L.D.: Slingshot. In 2017, the Netflix series Marvel's Iron Fist, Marvel's The Defenders, Marvel's The Punisher, and the ABC series Marvel's Inhumans were released, as well as the Hulu series Marvel's Runaways, and in 2018, the Freeform series Marvel's Cloak & Dagger. In 2020, the Hulu series Helstrom was released. These series were produced by Marvel Television. Phase Four was kicked off in 2021 by the Disney+ series WandaVision and is set to end in 2023 with Guardians of the Galaxy Vol. 3.

The films in the MCU received mostly positive reviews and were successful at the box office worldwide. The franchise is the most successful film series in cinema history, with total box office receipts of over $22.5 billion (as of November 24, 2019).