The Union for Reform Judaism (URJ), formerly known as the Union of American Hebrew Congregations (UAHC) until 2003, founded in 1873 by Rabbi Isaac Mayer Wise, is the congregational arm of Reform Judaism in North America. The other two arms established by Rabbi Wise are the Hebrew Union College-Jewish Institute of Religion and the Central Conference of American Rabbis. The current president of the URJ is Rabbi Rick Jacobs.

Isaac Mayer Wise was an American Reform rabbi, editor, and author. At his death he was called "the foremost rabbi in America".