Avraham Mordechai Alter (Polish: Abraham Mordekhaj Alter, Hebrew: ????? ????? ?????; 25 December 1866 – 3 June 1948), also known as the Imrei Emes after the works he authored, was the fourth Rebbe of the Hasidic dynasty of Ger, a position he held from 1905 until his death in 1948.
He was one of the founders of the Agudas Israel in Poland and was influential in establishing a network of Jewish schools there.
It is claimed that at one stage he led over 200,000 Hasidim.