Agent Carter is a 2013 American direct-to-video short film featuring the Marvel Comics character Peggy Carter, produced by Marvel Studios and distributed by Walt Disney Studios Home Entertainment. It is the fourth Marvel One-Shot short film set in the Marvel Cinematic Universe (MCU), sharing continuity with the films of the franchise and taking place after Captain America: The First Avenger (2011). The film is directed by Louis D'Esposito from a screenplay by Eric Pearson, and stars Hayley Atwell as Peggy Carter, along with Bradley Whitford and Dominic Cooper. In Agent Carter, Peggy Carter sets out on a solo mission to acquire the mysterious Zodiac while facing sexism post-World War II at the SSR, a precursor to S.H.I.E.L.D.

A Marvel One-Shot featuring Peggy Carter was in the works for some time before Atwell signed on to star in it, reprising her role from the Captain America films. D'Esposito, co-president of Marvel Studios and an executive producer on the feature films, aimed to replicate the period setting of Captain America: The First Avenger, while also giving the short a more modern, superhero feel. The film was a more ambitious production than previous One-Shots, with more action scenes and visual effects required than previously. Several other characters from Marvel Cinematic Universe films also appear, including Cooper reprising his role of Howard Stark.

The short was released on the home media release of Iron Man 3, and was received positively by critics and the audience from an earlier screening at San Diego Comic-Con. It won a Golden Reel Award. This response led to ABC ordering a television series expansion of the short, Agent Carter, which aired from January 2015 to March 2016, over two seasons.