Yaakov Shaul Elyashar (1 June 1817 – 21 July 1906), also known as Yisa Berakhah, was a 19th-century Sephardi rabbi in Ottoman Syria.

Yaakov Shaul Elyashar was born in Safed to a prominent Sephardi rabbinical family that had resided in the Land of Israel for centuries.

The family was thrown into poverty, and his mother sold her home and belongings and supported her only son by working as a seamstress.

They moved to Jerusalem; in 1828, she married Rabbi Binyamin Mordechai Navon [he], who adopted Elyashar and became his teacher and mentor.

He was to persuade the Jewish community there to annul its decision to cease receiving rabbinic emissaries (meshulachim) from the Land of Israel.