Abraham Zevi Idelsohn (Hebrew: אַבְרָהָם צְבִי אידלסון Avrohom Tzvi Idelsohn in Ashkenazi Hebrew; middle name also rendered Tzvi, Zvi, Zwi, or Zebi; June 11, 1882 – August 14, 1938) was a prominent Jewish ethnomusicologist and composer, who conducted several comprehensive studies of Jewish music around the world.