Margaret Elizabeth "Peggy" Carter is a fictional character appearing in American comic books published by Marvel Comics. She is usually depicted as a supporting character in books featuring Captain America. Created by writer Stan Lee and artist Jack Kirby, she debuted, unnamed, in Tales of Suspense #75 as a World War II love interest of Steve Rogers in flashback sequences. She would later be better known as the aunt of Sharon Carter.

Hayley Atwell portrayed the character in several projects of the Marvel Cinematic Universe from 2011 to 2019, including films, a short film, and television series, before playing alternate versions of the character known as Captain Carter in the animated series What If...? (2021–2024) and the film Doctor Strange in the Multiverse of Madness (2022), with the comic book version of the character subsequently being redesigned after Atwell.

The character debuted in a single panel (and unnamed) as a wartime love interest of Captain America in Tales of Suspense #75 (March 1966), and then receiving a backstory in #77 (May 1966). She was created by writer Stan Lee and artist Jack Kirby. She was created to give Sharon Carter a family background. She appeared again as the older sister of Sharon Carter in Captain America #161 (May 1973). She was later retconned as Sharon's aunt, then later great-aunt, due to the unaging nature of comic book characters. The character has appeared frequently in Captain America stories set during World War II.^{[citation needed]}

Dr. Peggy Carter joins the French Resistance as a teenager and becomes a skilled fighter, who serves on several operations alongside Captain America. The two fall in love, but an exploding shell gives her amnesia and she is sent to live with her parents in Virginia.

During the "Original Sin" storyline, it was revealed in 1952 that Peggy Carter worked with Howard Stark and Woody McCord when they investigated an alien ship in Siberia. The three of them worked to keep the alien from being taken by Hydra and had the alien live with Anton Vanko.

In the 1960s, Peggy Carter joins S.H.I.E.L.D. for a long tenure.

At the time when Captain America resurfaced, Peggy Carter was taking treatments from Doctor Faustus. When she was rescued by Captain America, she maintained her friendship with him.

Peggy Carter later helped Captain America fight the Secret Empire. She also dealt with his decision to stop being Captain America for a while.