This paper investigates heresies in the light of inculturation. The study on inculturation is one of the distinguishing marks of theology in the Philippines. An investigation on the positive contribution of heresies and heretics to inculturation is deatiled in this article. It begins with the meaning of heresy, heretics and inculturation. Second, it discusses the three main heresies during the Reformation dealing with the Sacred Scriptures together with their proponents. Third, it exposes the positive contributions of the said heresies to inculturation. It concludes with a summary of the reults of entire investigation.