Hillel Cohen-Bar (Hebrew: הלל כהן-בר; born in Jerusalem, 5 October 1961) is an Israeli scholar who studies and writes about Jewish-Arab relations in Palestine/Israel.

He is an associated professor at the Department of Islam and Middle East Studies at the Hebrew University of Jerusalem, and the head of the Cherrick Center for the Study of Zionism and the State of Israel at that university.

Two of his books deal with Palestinian collaborators and the Israeli security agencies using methodology that can be described as history-from-below.

The Jerusalem Post calls his books "an accessible mixture of academic research and vivid journalistic reporting.

Cohen manages to show empathy when relating human issues, but maintains a professional distance regarding events.