Jacob Itzhak Niemirower (Romanian: Iacob Isaac Niemirower, born March 1, 1872 in Lemberg, then in the Austro-Hungarian Empire, now Lviv, Ukraine - died November 18, 1939 in Bucharest, Romania) was a Romanian Modern Reform rabbi, close to reformistic trends in the Western European Judaism, theologist, philosopher and historian.
Served as the first Chief Rabbi of Romanian Jewry between 1921–1939, and was a member of the Romanian Senate from 1927 and until his death.
An ardent supporter of Zionism and a courageous fighter against Antisemitism, Dr.
Niemirower defended the civil and human rights of Romanian Jews and led them on the path towards modernization of community life, in the spirit of what he called Cultural Judaism.
This meant adhering to Jewish tradition while remaining open to the Romanian language and culture and to universal influences.