Rose Hobart (born Rose Kefer) was an American actress and Screen Actors Guild official. When Hobart was 15, she debuted professionally in Cappy Ricks, a Chautauqua production. She was accepted for the 18-week tour because she told officials that she was 18. At that same age, she was cast in Ferenc Molnár's Liliom, which opened in Atlantic City, New Jersey. Hobart's Broadway stage debut was on September 17, 1923 at the Knickerbocker Theater, playing a young girl in Lullaby. In 1925, she played Charmian in Caesar and Cleopatra.

Hobart was an original member of Eva Le Gallienne's Civic Repertory Theatre. In 1928, she made her London debut, playing Nona Rolf in The Comic Artist. During her career in theater, she toured with Noël Coward in The Vortex and was cast opposite Helen Hayes in What Every Woman Knows.