Giles Tremlett is a journalist, author and broadcaster based in Madrid, Spain, who has spent most of his journalistic career writing for The Guardian and The Economist . He is the author of two works of non-fiction that have been translated into half-a-dozen languages. He is currently a Contributing Editor to the Guardian newspaper, specializing in long form reportage and political analysis.  He was previously the newspaper's correspondent for Spain, Portugal and the Maghreb for a dozen years. He was also Madrid Correspondent for the Economist for a decade until 2016. He has been a regular current affairs commentator for various Spanish broadcasters, including state-owned TVE television and the country's biggest radio station, Cadena SER, as well as writing for several Spanish newspapers, including El País and El Mundo.
He was co-founder and curator of the Docubeats documentary project at The Guardian and El País. In 2012 he was voted Correspondent of the Year by the Madrid International Press Club.
Giles Tremlett is a Fellow of the Cañada Blanch Centre at the London School of Economics. He has been a guest lecturer on journalism or contemporary Spanish history and participant in seminars at numerous universities, including Oxford, MIT and Stanford. He graduated in Human Sciences (Anthropology) at the University of Oxford in 1984 and has also studied at the Universities of Barcelona and Lisbon.
He moved around the world from an early age, following his father Colonel Edward Tremlett to postings in South Africa, Tanzania, Kenya, Turkey and Germany. He had his first taste of Spanish life when he lived in Barcelona for two years in the mid eighties. After a period in Lisbon and then in London, he returned to live in Spain in the mid-1990s. He currently lives in Madrid with his wife Katharine Blanca Scott and their two children Lucas and Samuel.
His book Ghosts of Spain: Travels through a country’s hidden past (2007) was translated into five languages and has sold 120,000 copies worldwide.
In 2010 he published a biography of Catherine of Aragon, the Spanish infanta who was Henry VIII's first wife, with Faber and Faber in London and Walker in New York. Catherine of Aragon was BBC Radio 4's "Book of the Week" in November 2010 and was short-listed for the HW Fisher Best First Biography Prize. It sold some 60,000 copies worldwide and has been translated into Spanish, Russian and Polish.
His biography of Isabella of Castile will be published by Bloomsbury in the United States and United Kingdom early in 2017. He is currently working on a history of the International Brigades.
- Ghosts of Spain Faber and Faber. ISBN 978-0-571-22169-1
- Catherine of Aragon Walker & Company. ISBN 978-0-8027-7916-8
- Isabella of Castile Bloomsbury ISBN 978-1408853979