Mark R. Cohen (born March 11, 1943) is an American scholar of Jewish history in the Muslim world.
Cohen is Khedouri A. Zilkha Professor Emeritus of Jewish Civilization in the Near East and Professor Emeritus of Near Eastern Studies at Princeton University. He is a leading scholar of the history of Jews in the Middle Ages under Islam. His research relies greatly on documents from the Cairo Geniza. From 1985 until his retirement in 2013 Cohen also led the Geniza Lab at Princeton University, which aims to make the Geniza corpus available and searchable online (as of 2013, the database contained 4,320 documents). The project is headquartered at the S.D. Goitein Geniza Research Lab, where many of Goitein's personal books and notes are stored. In 2014 Cohen was a visiting professor at New York University Abu Dhabi.