Natalia Alianovna Romanoff, more commonly known as Natasha Romanoff, is a fictional character primarily portrayed by Scarlett Johansson in the Marvel Cinematic Universe (MCU) media franchise—based on the Marvel Comics character of the same name—sometimes known by her alias, Black Widow. Romanoff is depicted as an expert spy and hand-to-hand combatant, trained in the Red Room from childhood to be a KGB assassin. This brought her under S.H.I.E.L.D.'s radar, and Clint Barton is sent to kill her but instead spared her life and recruited her into the organization.

Scarlett Ingrid Johansson is an American actress. The world's highest-paid actress in 2018 and 2019, she has been featured multiple times on the Forbes Celebrity 100 list. Time named her one of the 100 most influential people in the world in 2021. Johansson's films have grossed over $15.4 billion worldwide, making her the highest-grossing box office female star of all time. She has received various accolades, including a British Academy Film Award, a Tony Award, and nominations for two Academy Awards and five Golden Globe Awards.