Ilan Pappé (Hebrew: אילן פפה‎, IPA: [iˈlan paˈpe]; born 1954) is an expatriate Israeli historian and socialist activist. He is a professor with the College of Social Sciences and International Studies at the University of Exeter in the United Kingdom, director of the university's European Centre for Palestine Studies, and co-director of the Exeter Centre for Ethno-Political Studies.

Pappé was born in Haifa, Israel. Prior to coming to the UK, he was a senior lecturer in political science at the University of Haifa (1984–2007) and chair of the Emil Touma Institute for Palestinian and Israeli Studies in Haifa (2000–2008). He is the author of The Ethnic Cleansing of Palestine (2006), The Modern Middle East (2005), A History of Modern Palestine: One Land, Two Peoples (2003), and Britain and the Arab-Israeli Conflict (1988). He was also a leading member of Hadash, and was a candidate on the party list in the 1996 and 1999 Knesset elections.

Pappé is one of Israel's New Historians who, since the release of pertinent British and Israeli government documents in the early 1980s, have been rewriting the history of Israel's creation in 1948, and the corresponding expulsion or flight of 700,000 Palestinians in the same year. He has written that the expulsions were not decided on an ad hoc basis, as other historians have argued, but constituted the ethnic cleansing of Palestine, in accordance with Plan Dalet, drawn up in 1947 by Israel's future leaders. He blames the creation of Israel for the lack of peace in the Middle East, arguing that Zionism is more dangerous than Islamic militancy, and has called for an international boycott of Israeli academics.

Pappé supports the one-state solution, which envisages a binational state for Palestinians and Israelis.

His work has been both supported and criticized by other historians. Before he left Israel in 2008, he had been condemned in the Knesset, Israel's parliament; a minister of education had called for him to be sacked; his photograph had appeared in a newspaper at the centre of a target; and he had received several death threats.