Judith Therese Evans (born July 20, 1975), known as Judy Greer, is an American actress, model, and author. Her notable television roles include Kitty Sanchez in the comedy series Arrested Development, Ingrid Nelson in the comedy series It's Always Sunny In Philadelphia, Trixie in the comedy-drama series Californication, and Cheryl Tunt in the animated comedy series Archer.

In film, Greer is known for her supporting roles in romantic comedies, with appearances in What Women Want (2000), The Wedding Planner (2001), 13 Going on 30 (2004), 27 Dresses (2008) and Love & Other Drugs (2010). Her other notable film appearances include roles in Adaptation (2002), The Village (2004), The Descendants (2011), Carrie (2013), Jurassic World (2015), and Halloween (2018). Greer has also portrayed Cornelia in the Planet of the Apes reboot series. In the Marvel Cinematic Universe, she portrays Maggie Lang in Ant-Man (2015) and Ant-Man and the Wasp (2018).

In 2011, Greer began hosting an online series of workout videos called Reluctantly Healthy, which was adapted into a series by Litton Entertainment in 2014 as part of their Saturday morning One Magnificent Morning block for The CW. Also in 2014, she released her first autobiographical novel, titled I Don't Know What You Know Me From: Confessions of a Co-Star.