Isaiah Sonne, sometimes also Isaia Sonne, (1887–1960) was a Jewish historian and bibliographer. Born in Galicia in 1887, he was educated in Switzerland and Italy, spending much of his career in the latter country as a teacher at Jewish colleges. After the implementations of the Italian Racial Laws in 1938, Sonne migrated to the United States where he taught at the Hebrew Union College in Cincinnati, where he died in 1960. Sonne made considerable contributions to the Wissenschaft des Judentums.