Israel "Iso" Szajewicz (1910–41) was a Polish-Jewish composer and conductor born in Kutno, Poland. His parents, Dineh and Józef Szajewicz, were Yiddish actors, on the road with a wandering Jewish theatre troupe. He was raised by his step-father, the actor Avrom Kurtz. He worked as a hairdresser and taught himself music in his young years.