Oleg Moiseyevich Kagan (Russian: Оле́г Моисе́евич Кага́н; 22 November 1946 Yuzhno-Sakhalinsk, Russian SFSR – 15 July 1990, Munich, West Germany) was a Soviet violinist, known for his chamber collaborations with such musicians as pianist Sviatoslav Richter and cellist Natalia Gutman, his wife. He was also a significant proponent of modern music, in particular Berg's Violin Concerto. Several recently released concert recordings have added to his posthumous reputation.