Ephraim Zalman Shor (Hebrew: אפרים זלמן שור; c. 1550 – 2 October 1633) was a 16th-century Czech rabbi who is best known for his rabbinic work on koshrut and the proper ritual slaughter of animals called Tevu'ot Shor.
His father Rabbi Naftali Zvi Hirsch Shor claimed to be a paternal descendant of Joseph ben Isaac Bekhor Shor, and a maternal descendant of Rashi.
In his early years Ephraim learnt Halakah under the supervision of his father.
[1] In his mid thirties Ephraim moved to Lublin where he acted as the cities Chief Rabbi.
Around 1600 he wrote his magnum opus Tevu'ot Shor which dealt with laws of koshrut and the proper halakahic ritual slaughter of animals.