Ostap Ortwin (real name Oskar Katzenellenbogen) (born November 23, 1876, murdered in spring 1942 in Lwów) was a Polish Jewish journalist and literary critic. He was born in Tłumacz, near Stanisławów (now Ivano-Frankivsk, Ukraine). His father, Henryk, was a director and an engineer at a sugar factory, and his mother's name was Maria Jadwiga. In 1899 he finished law studies at the University of Lwów. His thesis adviser was the famous Polish logician and philosopher Kazimierz Twardowski. Józef Wittlin, in his essay My Lwów described him in the following words: — Józef Wittlin