
Caitlin FitzGerald
Biography
Caitlin FitzGerald (born August 25, 1983) is an American actress and filmmaker. She is best known for her role as Libby Masters in the Showtime television drama Masters of Sex (2013–2016) and as the elusive Simone in Starz series Sweetbitter (2018–2019). She has appeared in Love Simple (2009), It's Complicated (2009), Gossip Girl (2011), Damsels in Distress (2011), Blue Bloods (2010), and Newlyweds (2011).
In 2010, she starred in a production of Hedda Gabler. In 2010, she also played the role of Benita in "After Hours", the 10th episode of the 1st season of the CBS crime drama, Blue Bloods. In 2012, she starred in and co-wrote the screenplay for the independent film Like the Water. In 2013, she starred as Liv in the independent romantic comedy ensemble Mutual Friends.
In 2013, she starred in the Showtime period drama Masters of Sex. In 2015, she appeared in the indie comedy Adult Beginners. In June 2017, she joined the cast of the film The Man Who Killed Hitler and Then the Bigfoot. She had a recurring role in the series Succession in 2018.
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Known For

TV
Law & Order: Special Victims Unit
Anna Bleers
1999

TV
Blue Bloods
Benita
2010

TV
Gossip Girl
Epperly Lawrence
2007

TV
New Girl
Diane
2011

TV
Project Runway
Self - Guest Judge
2004

TV
Succession
Tabitha Hayes
2018

TV
Masters of Sex
Libby Masters
2013

TV
UnREAL
Serena Wolcott
2015

TV
Rectify
Chloe
2013

TV
Inventing Anna
Mags
2022

TV
Station Eleven
Elizabeth
2021

TV
We Were Liars
Penny Sinclair
2025

TV
Sweetbitter
Simone
2018

Film
Taking Woodstock
Young Woman
2009

Film
It's Complicated
Lauren Adler
2009

Film
The Trial of the Chicago 7
Agent Daphne O'Connor
2020

Film
Adult Beginners
Kat
2014

Film
The Show
Sylvia
2017

Film
The Man Who Killed Hitler and Then the Bigfoot
Maxine
2019

Film
Lost on a Mountain in Maine
Mrs. Ruth Fendler
2024
Filmography
2026FilmOthelloas Desdemona2025TVWe Were Liarsas Penny Sinclair2024FilmLost on a Mountain in Maineas Mrs. Ruth Fendler2023FilmStillness2022TVInventing Annaas Mags2021TVStation Elevenas Elizabeth2020FilmThe Trial of the Chicago 7as Agent Daphne O'Connor2019FilmThe Man Who Killed Hitler and Then the Bigfootas Maxine2018TVSuccessionas Tabitha Hayes2018TVSweetbitteras Simone2018FilmAll I Wishas Alison2017FilmThe Showas Sylvia2016FilmAlways Shineas Beth2016FilmMercyas Melissa2015FilmManhattan Romanceas Theresa2015TVUnREALas Serena Wolcott2015FilmJim & Helen Foreveras Tess2014FilmAdult Beginnersas Kat2014FilmMutual Friendsas Liv2013TVMasters of Sexas Libby Masters2013TVRectifyas Chloe2012FilmThe Fitzgerald Family Christmasas Connie Fitzgerald2012FilmLike the Wateras Charlie2012FilmThe Break-Up Tour2012FilmDamsels in Distressas Priss2011FilmNewlywedsas Katie2011TVNew Girlas Diane2011FilmNational Lampoon's Dirty Movieas Bank Teller2010TVBlue Bloodsas Benita2009FilmIt's Complicatedas Lauren Adler2009FilmTaking Woodstockas Young Woman2009FilmLove Simpleas Keith2007TVGossip Girlas Epperly Lawrence2005FilmThe Visionary* - (*Tesla)as Katharine Johnson2004TVProject Runwayas Self - Guest Judge1999TVLaw & Order: Special Victims Unitas Anna Bleers—FilmAbove the Belowas Brooks