Mary Lynn Rajskub (/ˈraɪskəb/[1]) is an American actress and comedian who is best known for portraying Chloe O'Brian in the action thriller series 24 and Gail the Snail in It's Always Sunny in Philadelphia.

Rajskub was a regular cast member on HBO's Mr. Show with Bob and David, appeared in The Larry Sanders Show, Brooklyn Nine-Nine, and Veronica's Closet, and such films as Dude, Where's My Car?, Firewall, Sweet Home Alabama, Punch-Drunk Love, Mysterious Skin, Little Miss Sunshine, Sunshine Cleaning, Safety Not Guaranteed, and The Kings of Summer, among others.

[6] Rajskub's first part was as an Oompa-Loompa in a community theater production of Willy Wonka & the Chocolate Factory, and her first starring role was Raggedy Ann.

[8] From 1996–1998, she had a recurring role on the HBO series The Larry Sanders Show as booking assistant Mary Lou Collins, appearing in 18 episodes.

[9] Rajskub appeared in Kelsey Grammer's The Sketch Show on Fox Television, The King of Queens as a character named Priscilla, and in numerous films including Mysterious Skin, Legally Blonde 2, Sweet Home Alabama, Dude, Where's My Car?, Man on the Moon, Punch-Drunk Love, The Anniversary Party, Firewall, Little Miss Sunshine, music videos for Beck, Weezer and Sheryl Crow, as well as portraying a blind woman in the film Road Trip.

In 2006, she made a cameo appearance in "Partings", the 6th season finale of Gilmore Girls, where she played a trobairitz looking for her big break.

[citation needed] Rajskub has been nominated twice for a Screen Actors Guild Award; once in 2005, and again in 2007 for Outstanding Performance by an Ensemble in a Drama Series.

[citation needed] She guest-starred on Flight of the Conchords episode "Prime Minister" as Karen, an Art Garfunkel fanatic.

From July through October 2010, she performed in her solo show, Mary Lynn Spreads Her Legs, at the Steve Allen Theater in Los Angeles.

Reviewer F. Kathleen Foley of the Los Angeles Times wrote "that cheerfully vulgar title sums up the overall tone, which is often breezily obscene".

A comedy special that dealt with issues of domestic life as well as her stardom and work in various independent ventures, the performance was well-received by both critics and fans.

[17] In 2017, Rajskub appeared in the first season of the Adult Swim series Dream Corp LLC, playing Patient 46 in the episode "Are You Down With OCD?".

The movie received middling reviews, with Michael Phillips of The Chicago Tribune noting that "the actors aren't the problem with Night School; the material is.

[19] The same year, she appeared in Amazon's science fiction movie The Tomorrow War, starring Chris Pratt, Yvonne Strahovski and J.K. Simmons.