Catherine Marcelle Reitman (born April 28, 1981) is an American actress and film critic.
Reitman was born in Los Angeles, California, the daughter of French-Canadian actress Geneviève Robert and Slovak-born Canadian film director Ivan Reitman. Her father is from a Jewish family and her mother converted to Judaism. She attended the Cate School and majored in acting at University of Southern California.
Reitman starred in the television series The Real Wedding Crashers, based on the hit movie Wedding Crashers. She appeared in the films Knocked Up (2007) and I Love You, Man (2009). She has also had roles on the series Hollywood Residential, It's Always Sunny in Philadelphia, How I Met Your Mother, and Weeds.
In January 2011, Reitman launched Breakin’ It Down with Catherine Reitman, a film review web show on YouTube, which ended in July 2013. She occasionally fills in for Kevin Smith as a guest co-host with Ralph Garman on their podcast, Hollywood Babble-On.
Reitman is the sister of Caroline Reitman and director Jason Reitman. She is married to Philip Sternberg.