Otto Brahm (born Otto Abrahamson on 5 February 1856 in Hamburg; died 28 November 1912 in Berlin) was a German drama and literary critic, theatre manager and director. His productions were noted for being accurate and realistic. He was involved in the foundation of the progressive Freie Bühne (English: Free Stage) company, of which he became president and producer. He also edited the company's weekly magazine of the same name, but later changed its name to Die neue Rundschau.
Brahm also managed the Deutsches Theater in Berlin, and was responsible for modernising its output.