Selma Blair Beitner (born June 23, 1972) is an American actress. Blair started her professional acting career in 1995. During her early years, she played a large number of supporting roles in film and television, before obtaining recognition for her leading role in the film noir Brown's Requiem (1998).

Her breakthrough came in 1999, when she starred on The WB teen sitcom Zoe and in the coming-of-age drama Cruel Intentions. Blair continued to find commercial success with the comedies Legally Blonde (2001) and The Sweetest Thing (2002), and achieved international fame as a result of her portrayal of the heroine Liz Sherman in the fantasy films Hellboy (2004) and Hellboy II: The Golden Army (2008). Other notable films include Storytelling (2001), A Guy Thing (2003), The Fog (2005), Feast of Love (2007), The Poker House (2008), Dark Horse (2011), In Their Skin (2012), Mothers and Daughters (2016) and Ordinary World (2016).

Blair portrayed the leading role in the American remake of Kath & Kim as Kim (2008–2009), and on the sitcom Anger Management (2012–2014). Blair also appeared as socialite Kris Jenner in the first season of FX true crime anthology series American Crime Story (2016). In 2011, Blair lent her voice to narrate the Holocaust-related audio documentary The Diary of Anne Frank, garnering a Grammy Award for Best Spoken Word Album for Children nomination.