Black Widow is a 2021 American superhero film based on Marvel Comics featuring the character of the same name. Produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures, it is the 24th film in the Marvel Cinematic Universe (MCU). The film was directed by Cate Shortland from a screenplay by Eric Pearson, and stars Scarlett Johansson as Natasha Romanoff / Black Widow alongside Florence Pugh, David Harbour, O-T Fagbenle, Olga Kurylenko, William Hurt, Ray Winstone, and Rachel Weisz. Set after the events of Captain America: Civil War (2016), the film sees Romanoff on the run and forced to confront a conspiracy tied to her past.

Development of a Black Widow film began in April 2004 by Lionsgate, with David Hayter attached to write and direct. The project did not move forward and the character's film rights reverted to Marvel Studios by June 2006. Johansson was cast in the role for several MCU films beginning with Iron Man 2 (2010), and began discussing a solo film with Marvel. Work began in late 2017, with Shortland hired in 2018. Jac Schaeffer and Ned Benson contributed to the script before Pearson was hired. Filming took place from May to October 2019 in Norway, Budapest, Morocco, Pinewood Studios in England, and in Atlanta, Macon, and Rome, Georgia.  

Black Widow premiered on June 29, 2021, at various events around the world, and was released in the United States on July 9 simultaneously in theaters and through Disney+ with Premier Access. It is the first film in Phase Four of the MCU, and was delayed three times from an original May 2020 release date due to the COVID-19 pandemic. Black Widow broke several pandemic box office records upon release, and has grossed over $159 million worldwide, and made over $60 million in Disney+ global revenue. The film was met with generally favorable reviews from critics, with praise for the performances (particularly Johansson and Pugh) and action sequences.