Jacob ben Abraham Kahana (Hebrew: יעקב בן אברהם כהנא; died 1826) was a rabbinical author.
He lived with his father-in-law, and was supported by him for many years, so that he was able to devote his time to the study of the Law; and he became one of the leading Talmudical scholars in Vilna.
After Issachar's death Jacob was appointed trustee of the charities of the city.
The manuscript was revised and the work published in Lemberg, 1863, by Raphael Nathan Rabbinowicz.
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