Caitlin FitzGerald

In June 2017, FitzGerald joined the cast of Robert Krzykowski's film The Man Who Killed Hitler and Then the Bigfoot, co-starring with Sam Elliott and Aidan Turner.

In 2015, she appeared in the indie comedy Adult Beginners (previously called Brother's Keeper) from director Ross Katz as Kat, the girlfriend of Jake (Nick Kroll) who dumps him after his tech startup fails and he moves back to his family home. Rose Byrne and Bobby Cannavale co-star.

FitzGerald starred in the Showtime period drama Masters of Sex. Indiewire has described her character as one of the most underrated in television: "Libby Masters is a character who could easily have come across as insipid instead of likable and poignant ... FitzGerald fully conveys Libby's willowy fragility, her fairly sheltered outlook and girlishness – she sometimes calls her husband "Daddy"—while making it clear she isn't a simple stand-in for conservative values or cluelessness ... FitzGerald makes Libby's perceptiveness and her transparency clear."

In 2012, FitzGerald starred in and co-wrote the screenplay for the independent film Like the Water, set in Maine. The film focuses on the death of a childhood friend, inspired by the sudden death of FitzGerald's Riley School classmate Sabrina Seelig. She also co-starred that year in The Fitzgerald Family Christmas, reuniting with director Ed Burns. In 2013, she starred as Liv in the independent romantic comedy ensemble Mutual Friends directed by Matthew Watts.

In 2010, FitzGerald starred in a production of Hedda Gabler. The play was performed in a private house in New York City to an audience of just twenty-five people. FitzGerald was excited to play "the greatest part written for a woman that isn’t Shakespeare". Ben Brantley of The New York Times said of her performance: "All legs, eyes and cheekbones, with a face that seems made for cinematic close-ups, she’s a hypnotic pleasure to look at." However, he felt she had insufficient gravitas, often bringing to mind "a newly transferred, intimidatingly classy high school senior, perhaps, who is so beyond being merely popular".

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.

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 and as the elusive Simone in Starz series Sweetbitter.