​Selma Blair Beitner (born June 23, 1972) is an American actress. She's known for her roles in the comedies Legally Blonde (2001) and The Sweetest Thing (2002), and achieved international fame with her portrayal of Liz Sherman in the big-budget fantasy films Hellboy (2004) and Hellboy II: The Golden Army (2008).

After training at the Stella Adler Conservatory of Acting, Blair began acting in the mid-90s. Blair began her career with small roles and guest roles in various television series. Blair appeared with co-stars Sarah Michelle Gellar, and Ryan Phillippe in the 1999 film Cruel Intentions, for which Blair won an MTV Movie Award for Best Kiss - Lesbian Kiss between Blair and co-star Gellar.