Walter Emil Kaegi (November 8, 1937,New Albany, Indiana - February 24, 2022) was a historian and scholar of Byzantine history, professor of history at the University of Chicago, and a Voting Member of The Oriental Institute. He received his B.A. from Haverford College in 1959 and his PhD from Harvard University in 1965. He was known for his researches on the period from the 4th through 11th centuries with a special interest in the advance of Islam, interactions with religion and thought, and military subjects. Kaegi is also distinguished for analyzing the Late Roman period in European and Mediterranean context, and has written extensively on Roman, Vandal, Byzantine and Muslim occupation of North Africa. He was known also as the co-founder of the Byzantine Studies Conference and the editor of the journal Byzantinische Forschungen.