Oscar Blum (? – ?) was a Lithuanian–French chess master.

He won, ahead of Nicolas Rossolimo and Vitaly Halberstadt, in the 8th Paris City Chess Championship in 1932.[1] 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.[2][3]