Elizabeth Anne "Lizzy" Caplan (born June 30, 1982) is an American actress. She is best known for her roles in the CBS show The Class, in the 2004 film Mean Girls, and the 2008 film Cloverfield. She has also guest starred on the critically acclaimed HBO TV series True Blood in 2008 and currently stars as "Casey" in the Starz network comedy Party Down.

Caplan was born in Los Angeles, California and grew up in a Reform Jewish family. She attended Alexander Hamilton High School in Los Angeles, where she starred in such productions as Much Ado about Nothing and You Can't Take It with You.

Caplan began her television acting career in 1999 playing the minor role of Sara on the series Freaks and Geeks. She had a series of guest appearances on numerous shows, and was a guest on The Sharon Osbourne Show. Caplan also appeared in Jason Mraz's music video "You and I Both". In 2001, she played "freak of the week" Tina Greer in an episode of Smallville, and reprised her role on the show in 2003. For two episodes she also appeared on the series Once and Again as Sarah, the ex-girlfriend of Katie Singer (Mischa Barton).