Maria Osipovna (Iosifovna) Knebel was a Soviet and Russian actress, theatre practitioner and acting theorist. Having trained with Konstantin Stanislavski, Vladimir Nemirovich-Danchenko, and Michael Chekhov, her work integrated the approaches and emphases of all three, with a particular focus on Stanislavski's technique of "active analysis" in the rehearsal of plays. She worked as a character actor, a theatre director, and a teacher. Her students included the actor Oleg Yefremov, the playwright Viktor Rozov, and the directors Anatoly Vasiliev, Leonid Heifetz, Alexander Burdonsky, Beno Axionov, Joseph Raihelgauz, Sergei Artsibashev and Adolf Shapiro as well as director and theatre practitioner Sam Kogan. In 1958, she was named a People's Artist of the RSFSR.