Osip Pravdin (born Oskar Treyleben) was an actor and theatre pedagogue. Born in 1849 in Saint Petersburg, he began his stage career in amateur circles, later performing in provincial theatres in Kronstadt, Oranienbaum, Helsingfors, Novocherkassk, and Tiflis. In 1875, he debuted at the Alexandrinsky Theatre. From 1878 until the end of his life, he served in the troupe of the Maly Theatre. Osip Pravdin gained fame as a master of character roles, distinguished by lifelike authenticity, meticulous attention to detail, and an ability to convey the social and national distinctiveness of his characters. He was particularly successful in roles of "Russian Germans", such as Schaaf in the play "A Month in the Country" by Ivan Turgenev and Osterhausen in the play "Gentleman" by Alexander Sumbatov-Yuzhin. His repertoire also included classical roles: Tarelkin in the play "The Case" by Alexander Sukhovo-Kobylin, Krutitsky and Kuchumov in the plays "There Was Not a Penny, But Suddenly Altyn" and "Enough Simplicity in Every Wise Man" by Alexander Ostrovsky, Repetilov in "Woe from Wit" by Alexander Griboyedov, and Rastakovsky and the Mayor in "The Government Inspector" by Nikolai Gogol. From the 1880s, Osip Pravdin was actively engaged in pedagogical work: he taught at the dramatic courses of the Moscow Theatre School and headed the dramatic classes of the Musical-Dramatic School of the Moscow Philharmonic Society. Among his students was the actress Elizaveta Sadovskaya. Osip Pravdin also organized provincial tours for the actors of the Maly Theatre. In 1917, he was the manager of the Maly Theatre, and from 1918, he was a member of its board of directors. The online collection of the Bakhrushin Theatre Museum features archival materials (including letters by Osip Pravdin and texts of his roles), photographs of the actor, as well as his makeup kits.