Jaime Alvar Ezquerra (born April 20, 1955) is a Spanish historian, author and professor at the Charles III University of Madrid, specializing in ancient history.
He has been a visiting professor at the University of Tor Vergata (Rome, Italy), Franche-Comté (France) and Potsdam (Germany).
His career has focused on the early history of the Iberian Peninsula Greek and Phoenician colonization in the Mediterranean and Tartessic worlds.
He is a recognized authority on Religion in ancient Rome, especially the romanization of oriental gods Mithra, Isis, Serapis, Cybele and Attis, as well as the processes of religious transformation of the indigenous peninsular world in contact with other Mediterranean peoples.
He is currently working on the analysis of the construction of history and director of The Julio Caro Baroja Institute of Historiography of the Charles III University of Madrid.