Martti Heikki Nissinen (born April 22, 1959 in Kuopio) is a Finnish theologian, serving since 2007 as Professor of Old Testament studies in the Faculty of Theology at the University of Helsinki. He is known as an expert of the prophetic phenomenon in the ancient Eastern Mediterranean, but his research interests include also gender issues (love poetry, homoeroticism, masculinity) in the ancient Eastern Mediterranean. He has written and edited several books and a significant number of articles on topics related to prophecy, gender, and history of ancient Near Eastern religion.