Solomon Judah Loeb Rapoport (Hebrew: שלמה יהודה כהן רפאפורט; June 1, 1786 – October 15, 1867) was a Galician and Czech rabbi and Jewish scholar.

Because of his work on Saadia Gaon, see below, he received recognition in the scholarly world and gained "many enthusiastic friends", especially S. D. Luzzatto,[2] leading to his appointment as Rabbi.

Rapoport was instrumental in publishing his father-in-law's work Avnei Miluim, writing the index, sources, and numerous comments.

He suggests that the passage in the Sefer Yetzirah, which discusses the manipulation of letters in the creation of the world, can be better understood if the Sephirot refer to vowel sounds.

His position is based on his belief that most Kabbalistic works written after Sefer Yetzirah (including the Zohar) are forgeries.