Eric Christiansen (15 September 1937 – 31 October 2016) was a medieval historian and fellow emeritus of New College, Oxford University.^[1][2][3]

Christiansen was educated at Charterhouse School after which he served in the ranks of the Northamptonshire Regiment. He became a fellow of New College after completing a thesis on modern Spanish history but subsequently specialised in medieval history.

Selected publications

• The origins of military power in Spain, 1800-1854. Oxford University Press, Oxford, 1967. (Oxford Historical Monographs)
• The Northern Crusades, the Baltic and the Catholic Frontier, 1100-1525. Macmillan, 1980. (New Studies in Medieval History) ISBN 978-0333262436
• The Works of Sven Aggesen: Twelfth-century Danish Historian. Viking Society for Northern Research, 1992. ISBN 978-0903521246
• Dudo of St Quentin: History of the Normans. Translation with introduction and notes. Boydell Press, 1998. ISBN 978-0851155524
• The Norsemen in the Viking Age. Wiley Blackwell, 2002. (The Peoples of Europe) ISBN 978-0631216773