Lindsay Croisdale-Appleby

Lindsay Redvers Mark Seymour Croisdale-Appleby (born 12 May 1973) is a British diplomat and Head of the UK Mission to the European Union. Appointed in January 2021, he formally presented his credentials to the President of the European Commission on 29 July 2021. He was Ambassador to Colombia from 2012 to 2015.

Early life He studied modern history at St Hugh's College, Oxford, and gained an MA in international relations and international law from Lancaster University. He then served as Ambassador to Colombia from November 2012 to 2015 before taking up an appointment as Europe Director in the Foreign Office. He was promoted to Director-General, EU Exit at the Foreign Office in 2017. He was Deputy Sherpa and Deputy Chief Negotiator in Taskforce Europe (10 Downing Street) throughout 2020. On 21 January 2021, he was appointed to succeed Sir Tim Barrow as Head of the UK Mission to the European Union.

It was announced that Croisdale-Appleby would be leaving his role as EU Ambassador in 2026, to be replaced by Caroline Wilson. In September 2025, it was reported that Croisdale-Appleby was one of the front-runners from within the Diplomatic Service to succeed Peter Mandelson as British Ambassador to the United States, or as Permanent Representative of the United Kingdom to the United Nations, succeeding Barbara Woodward.

Personal life He married Barbara Jaimes-Quero in September 2003 and they have a son and a daughter. He has an older brother.