Pom Alexandra Klementieff (born 3 May 1986) is a French actress of mixed Korean-Russian-French ancestry. She was trained at the Cours Florent drama school in Paris and appeared in such French films as The Easy Way (2008) and Sleepless Night (2011), before making her American film debut in Oldboy (2013). In 2019, she also made an appearance in Striking Vipers, the first episode of the fifth series of the anthology series Black Mirror.

Klementieff received worldwide recognition for her role as Mantis in the Marvel Cinematic Universe films Guardians of the Galaxy Vol. 2 (2017), Avengers: Infinity War (2018), Avengers: Endgame (2019), Thor: Love and Thunder (2022), the television film The Guardians of the Galaxy Holiday Special (2022), and Guardians of the Galaxy Vol. 3 (2023).