Shabtai Horowitz (Hebrew: שבתי הורוויץ; c. 1590 – 12 April 1660) was a rabbi and talmudist, probably born in Ostroh, Volhynia.
He was the son of the kabbalist Isaiah Horowitz, and at an early age married the daughter of the wealthy and scholarly Moses Charif of Lublin.
Horowitz wrote additions to his grandfather Abraham's Emeḳ Berakah (which appeared first in the Amsterdam edition of 1729), additions to his father's prayer-book, and a treatise on religious ethics under the title Vave Ha-Ammudim.
It contains, besides some very charitable teachings, exhortations to strictness in ritual practise and in kabbalistic studies.
Shabbethai further wrote some prayers (included in his father's prayer-book), especially a selichah for the 20th of Sivan.