Ethan Hawke as Lorenz Hart

Margaret Qualley as Elizabeth Weiland

Bobby Cannavale as Eddie

Andrew Scott as Richard Rodgers

Jonah Lees as Morty Rifkin

Simon Delaney as Oscar Hammerstein II

Patrick Kennedy as E.B. White

Giles Surridge as Sven

John Doran as Weegee

Caitríona Ennis as Cigarette Girl

Ian Dillon as Elizabeth’s Mothers Friend (uncredited)

Brian Briggs as Waiter

Ray Weafer as Maitre'd at Sardi's (credit only)

Cillian Sullivan as Stephen Sondheim

David Rawle as George Roy Hill

Andrew Bennett as Oklahoma City Mayor