Shemaiah of Soissons was a French Jewish scholar of the 12th century. He is often erroneously identified with Shemaiah of Troyes.
He was a pupil of Rashi, and Abraham Epstein identified him as Rashi's "secretary" and "scribe". Rashi referred to him as "our brother Shemaiah", and wrote that due to their shared study of Ezekiel, Rashi changed one of his interpretations.