Caitlin Fitzgerald is an American actress best known for her starring role as Libby Masters, the neglected wife of Bill Masters and best friend of his mistress, in the period drama television series Masters of Sex.
In film, she can be seen opposite Nick Kroll, Bobby Cannavale and Rose Byrne in director Ross Katz's comedy Brother's Keeper. She was also seen in the romantic drama Mutual Friends and is best known for her film roles in It's Complicated, starring opposite John Krasinski and Meryl Streep.
Other film credits include Whit Stillman's Damsels in Distress, Taking Woodstock and Edward Burns' Newlyweds and Fitzgerald Family Christmas.
FitzGerald's additional television credits include Gossip Girl, How To Make It In America, Mercy and Law & Order: Special Victims Unit.
She divides her time between New York and Los Angeles.