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. He was the most outstanding student and the spiritual heir of Rabbi Isaac ben Samuel ha-Zaken (the Ri). He is referred also known as "the Rash" ( הר"ש; an acronym of his name) or "the Prince of Sens", and within Tosafot as "Rashba".