Giles E.H. Tremlett (born Plymouth, 1962) is a historian, author and journalist based in Madrid, Spain. Tremlett is author of five works of history and non-fiction that have been translated into half a dozen languages. He won the Elizabeth Longford Prize for Historical Biography in 2018. He has held various roles for The Guardian, including as chief correspondent in Iberia and as a Long Reads writer. He previously wrote for The Economist. He was a Visiting Fellow at the London School of Economics for five years from 2016.