Einar Thomassen (born 25 April 1951) is a Norwegian religious studies scholar.
Thomassen was in Bergen, and grew up in Laksevåg.
He was taught Coptic, Greek and Latin already during Bergen Cathedral School.
He lectures in Christianity, Islam, Religion of the Antique and Classical World, pre-Islamic Middle-East, Syncretism, and Method.
He is a member of the Norwegian Academy of Science and Letters.