Levi Yitzchak HaLevi Horowitz (born 3 July 1921, Boston,[1] died 5 December 2009, Jerusalem[2]) was a rabbi and the second rebbe of the Boston Hasidic Dynasty founded by his father, Pinchos Dovid Horowitz.

He was the first American-born Hasidic rebbe[3] and the founder of ROFEH International, a community-based medical referral and hospitality liaison support agency.

In November 1942[1] he married Raichel Unger Leifer of Cleveland, Ohio,[5][6] a descendant of Naftali Tzvi of Ropshitz.

[3][7] Upon becoming leader of the Bostoners in 1944, after his marriage and ordination at Yeshiva Torah Vodaath, he announced that his primary thrust as rebbe would be aimed at the area's large number of college students, many of whom were away from home[3] In 1984, Horowitz established Givat Pincus, a Hasidic community in the Har Nof neighborhood of Jerusalem and began dividing his time between Israel and Boston.

At the time of his death, he resided both in the U.S. and in Israel spending half a year in each country.