Oscar Blum (1886  – ?) was a Lithuanian–French chess master. He was pushed off Lenin's 1917 train by Lenin himself  This incident is mentioned in Ben Kingsley's Lenin movie (Lenin...The Train), and in James Wollrab: Russian Winter p. 206 
He won, ahead of Nicolas Rossolimo and Vitaly Halberstadt, in the 8th Paris City Chess Championship in 1932. Dr Oscar Blum played at Folkestone 1933. He participated not in the 5th Chess Olympiad but in the General Congress, finishing second, half a point behind Eugene Znosko-Borovsky.
- Wollrab, James (February 2007). Russian Winter. ISBN 9780595428045.
- Blum, Oskar (1923). Russiche Köpfe. Berlin: Franz Scheider Verlag.
- Haupt, Georges; Marie, Jean-Jacques (2017). Makers of the Russian Revolution: Biographies. Routledge. ISBN 9781315400204.
- Champ Paris 1932
- Chess Notes by Edward Winter
- NED-ch08 The Hague/Leiden 1933 Archived August 7, 2007, at the Wayback Machine