Black Widow (Natalia Alianovna "Natasha" Romanova) is a fictional character in the Marvel Comics universe. Created by editor and plotter Stan Lee, scripter Don Rico, and artist Don Heck, the character debuted in Tales of Suspense #52 (April 1964).

The character was introduced as a Russian spy, an antagonist of the superhero Iron Man. She is the second character who have assumed the mantle of Black Widow. She later defected to the United States, becoming an agent of the fictional spy agency S.H.I.E.L.D., and is the only female member of the Avengers.

The character has appeared in numerous forms of media, such as animated television series, video games, and films. In animation, she is voiced by Laura Bailey. Scarlett Johansson portrayed Natasha Romanoff in the Marvel Cinematic Universe movies Iron Man 2 (2010), The Avengers (2012), Captain America: The Winter Soldier (2014), Avengers: Age of Ultron (2015), Captain America: Civil War (2016), Avengers: Infinity War (2018), Captain Marvel (2019), Avengers: Endgame (2019), and Black Widow (2021), with Lake Bell voicing the character in the animated series What If...? (2021).