Rabbi Isaac ben Eliezer Halevi (Hebrew: רבי יצחק בן אליעזר הלוי; died 1070) also known as Rabbi Isaac Segan Lewiyah (Hebrew: רבי יצחק סגן לויה) was an 11th-century French Talmudist, liturgical poet and Tosafist who flourished in Germany.
Born in Lorraine, France,"Sefer Ha-Pardes," p. 35a; "Sefer Asufot," p. 150a in his early years he studied under Gershom ben Judah, later moving to Worms where he served as the city's Chief Rabbi. He was an important teacher of Rashi, to whom he was apparently related. Rashi mentions him in his commentary on the TalmudRashi mentions him in Yoma 39a; Shevu'ot 46b; Sukkah 35b; Megillah. 26a and twice in his commentary on the Bible.Rashi mentions him in 1 Sam.1:24 and Prov.19:24 He was the author of four wedding piyyutim, known as "Yotzer", "Ofan," "Zulat," and "Reshut". Abraham Zacuto states that he died in 1070 while Zunz states that he died between 1070 and 1096. For the partial collection of Rabbi Yitzchak Ben Eliezer Halevi's scanned manuscripts, see the Ketiv website - The National Library of Israel
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