Samson ben Abraham of Sens (שמשון בן אברהם משאנץ; c. 1150 – c. 1230),was one of the leading French Tosafists in the second half of the 12th and the beginning of the 13th centuries.
The Rosh said of him that only Rabbeinu Tam and Rabbi Isaac ben Samuel exercised greater influence upon Talmudical studies in France and in Germany during the 13th century.
He kept up a lively correspondence with Rabbi Meïr Abulafia, and like him, condemned Maimonides' rationalistic views on bodily resurrection and Talmudic haggadah.
Due to persecution of the Jews by Pope Innocent III, the Rash joined 300 English and French rabbis in emigrating to Palestine about 1211.
He frequently refers therein to the Jerusalem Talmud, to which he devoted more attention than any of his predecessors or contemporaries, and to the older compilations Tosefta, Mechilta, Sifra, and Sifre, and he tries to reconcile the discrepancies between them and the Mishnah.
According to Jacob ben Aksai, Rabbi Samson also wrote commentaries on Shekalim, Eduyot, Middot, and Dinnim, but none are extant.