Zosia Mamet is an American actress best known for her starring role as Shoshanna Shapiro in the dark comedy-drama television series Girls.
She is also known for her recurring television roles as Courtney in United States of Tara (2010), as Kelsey in Parenthood (2010-2011) and as Joyce Ramsay in Mad Men from 2010-2012.
She also had a recurring role in the television series The Unit and has acted in several feature films including Spartan, Off the Ledge, The Kids Are All Right, Greenberg, Cherry, Sunset Stories, The Last Keepers and Rhymes with Banana.
Mamet was born in Randolph, Vermont. She is the daughter of American playwright, essayist, screenwriter and film director David Mamet and actress Lindsay Crouse.