Captain America: The First Avenger is a 2011 American superhero film based on the Marvel Comics character Captain America. Produced by Marvel Studios and distributed by Paramount Pictures, it is the fifth film in the Marvel Cinematic Universe (MCU). The film was directed by Joe Johnston, written by Christopher Markus and Stephen McFeely, and stars Chris Evans as Steve Rogers / Captain America alongside Tommy Lee Jones, Hugo Weaving, Hayley Atwell, Sebastian Stan, Dominic Cooper, Toby Jones, Neal McDonough, Derek Luke, and Stanley Tucci. During World War II, Rogers, a frail man, is transformed into the super-soldier Captain America and must stop the Red Skull (Weaving) from using the Tesseract as an energy source for world domination.

The film began as a concept in 1997 and was scheduled for distribution by Artisan Entertainment. However, a lawsuit disrupted the project and was not settled until September 2003. In 2005, Marvel Studios received a loan from Merrill Lynch, and planned to finance and release the film through Paramount Pictures. Directors Jon Favreau and Louis Leterrier were interested in directing the project before Johnston was approached in 2008. The principal characters were cast between March and June 2010. Production began in June, and filming took place in London, Manchester, Caerwent, Liverpool, and Los Angeles. Several different techniques were used by the visual effects company Lola to create the physical appearance of the character before he becomes Captain America.

Captain America: The First Avenger premiered at the El Capitan Theatre in Los Angeles on July 19, 2011, and was released in the United States on July 22, as part of Phase One of the MCU. The film was commercially successful, grossing over $370 million worldwide, and received positive reviews from critics, who praised Evans' performance, the film's depiction of its 1940s time period, and Johnston's direction. Two sequels have been released: Captain America: The Winter Soldier (2014) and Captain America: Civil War (2016).