Olivia Jane d'Abo (born 22 January 1969) is an English actress, voice actress, and singer-songwriter. She is best known for her roles as Princess Jehnna in Conan the Destroyer (1984), Karen Arnold on The Wonder Years, Mara Simons in Beyond the Stars (1989), Angela in Point of No Return (1993), Betty Jo in Wayne's World 2 (1993), Molly Richardson in Greedy (1994), Marie Blake on the NBC sitcom The Single Guy, Anna Montgomery in The Big Green (1995), Tracey Meltempi in It Had to Be You (2000), and Nicole Wallace on Law & Order: Criminal Intent.

She has voiced the characters of Jane Porter in the Disney Channel animated series The Legend of Tarzan and the movie Tarzan & Jane, Rox in the 'Matriculated' segment of The Animatrix, Natalia Romanoff / Black Widow in the animated movies Ultimate Avengers 1 & 2 , Luminara Unduli in the animated series Star Wars: The Clone Wars and in the film Star Wars: The Rise of Skywalker.

She was engaged to singer Julian Lennon, which ended in 1992. Her son, Oliver William d'Abo, was born in 1995. In 1998, she became engaged to actor Thomas Jane after working with him on several projects, but the couple called it off in 2001. She was married to songwriter and music producer Patrick Leonard from 2002 to 2012. She dated professional skateboarder James Quakenbush from 2019 to 2022.

Her father is singer-songwriter Mike d'Abo, lead vocalist of the group Manfred Mann.

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