Avichai Rontzki (Hebrew: אביחי רונצקי, October 10, 1951 – April 1, 2018) was the Chief Military Rabbi of the Israel Defense Forces. He served in the position from 2006 to 2010, with a rank of Brigadier General.
His predecessor in that position was Rabbi Israel Weiss. Rontzki was also the rosh yeshiva of the Hesder Yeshiva in the West Bank settlement Itamar.
His four years in office have led to several controversies. Some of his statements upset not only secular Israelis, but led many organizations outside of Israel to accuse him of inciting terrorism.