Liv Bernhoft Osa is a Norwegian actress. She was born in Voss, a daughter of folk musician Sigbjørn Bernhoft Osa. She made her stage debut at Nationaltheatret in 1979, and has since mainly been assigned with this theatre, except for shorter periods at other theatres. She received the Hedda Award in 2011, for best female supporting role in the play Uskyld. She received the Amanda Award for best leading actress in the 2016 film Pyromaniac.