Turan Dursun (1934 – 4 September 1990) was a Turkish author and atheist who was a critic of Islam. A former Muslim cleric and scholar of Shia Islam, he became an atheist during his study of the history of monotheistic religions. Influenced by the 9th-century Iranian skeptic philosopher Ibn al-Rawandi, Dursun wrote a number of books about religion which included interpretations of Islamic texts, heavily criticizing Islam and the founders of its major branches.

Dursun was frequently threatened by Islamic fundamentalists, and on 4 September 1990 was assassinated outside his home in Istanbul, after which his books sold tens of thousands of copies in Turkey.