Igor Borisovich Markevitch (Russian: Игорь Борисович Маркевич, Igor Borisovich Markevich, Ukrainian: Ігор Борисович Маркевич, Ihor Borysovych Markevych; 27 July 1912 – 7 March 1983) was a Russian composer and conductor who studied and worked in Paris and became a naturalized Italian and French citizen in 1947 and 1982 respectively. He was commissioned in 1929 for a piano concerto by impresario Serge Diaghilev of the Ballet Russe de Monte Carlo.

Markevitch settled in Italy during World War II. After the war, he moved to Switzerland. He had an international conducting career from there. He was married twice and had three sons and two daughters.