Regina Marie "Jenna" Fischer (born March 7, 1974) is an American actress best known for her portrayal of Pam Beesly on the NBC sitcom The Office, for which she was nominated for the Primetime Emmy Award for Outstanding Supporting Actress in a Comedy Series in 2007.

Since then, Fischer has appeared in such films as Blades of Glory (2007), Walk Hard: The Dewey Cox Story (2007), The Promotion (2008), Hall Pass (2011), and The Giant Mechanical Man (2012), a film directed by her husband, Lee Kirk. She also appeared as Rhonda McNeil in the NBC's comedy-drama series You, Me and the Apocalypse. Fischer currently stars in the ABC sitcom, Splitting Up Together (2018–).

Fischer's first book, The Actor's Life: A Survival Guide, with an introduction by Steve Carell, was published in November 2017.