Profiat Duran (c. 1350 – c. 1415) (Hebrew: פרופייט דוראן), full Hebrew name Isaac ben Moses haLevi) was a Jewish apologist/polemicist, philosopher, physician, grammarian, and controversialist in the 14th century. He was later sometimes referred to by the sobriquet Efodi (האפודי) through association with his two grammars entitled Ephod. After being forcibly converted to Christianity in 1391, he also appears in official records under his Converso name Honoratus de Bonafide. After escaping Spain, he returned to practicing Judaism openly and wrote several works including polemics against Christianity and grammar.