Abraham bar Hiyya Hanassi (Hebrew: אברהםברחייאהנשיא Abraham wire of Hiyya " Prince") (1070 Barcelona, Spain - 1136 Provence, France) was a rabbi, mathematician, astronomer and philosopher, also known under the name of Savasorda (of the Arab صاحبالشرطة Sâhib ash-Shurta " Chief of Garde"). He lived mainly in Barcelona.

He diffused the quadratic equation in Occident, in disturbed times where the knowledge travelled little.

He is also author of Higayon haNefesh (Logical of the heart) and Meguilat HaMegualè (the Roller of Revealing), first philosophical works written in Hebrew, although theology, the eschatology and ethics are approached there than philosophy itself.

Its thought borrows from Aristote as much as with Plotin. Thus, it subscribes to the doctrines emanationnist, but intercalates a world of light and a world of domination between God and the spiritual substances. Its designs of form and matter are, as for them, aristotelicians, because these principles can exist only in the body world and not in that of the simple substances.