Tim Barrow

His Excellency Sir Tim Barrow GCMG LVO MBE
Tim Barrow, 2022
United Kingdom National Security Adviser
In office 14 September 2022 – 8 November 2024
Prime Minister	Liz Truss Rishi Sunak Keir Starmer
Preceded by	Stephen Lovegrove
Succeeded by	Jonathan Powell
Second Permanent Under-Secretary and Political Director of the Foreign, Commonwealth and Development Office
In office 1 September 2020 – 6 September 2022
Prime Minister	Boris Johnson
Preceded by	Richard Moore
Succeeded by	Christian Turner
British Ambassador to the European Union
In office 1 February 2020 – 21 January 2021
Monarch	Elizabeth II
Prime Minister	Boris Johnson
Deputy	Katrina Williams
Preceded by	Office established
Succeeded by	Lindsay Croisdale-Appleby
Permanent Representative of the United Kingdom to the European Union
In office 4 January 2017 – 31 January 2020
Monarch	Elizabeth II
Prime Minister	Theresa May Boris Johnson
Deputy	Katrina Williams
Preceded by	Ivan Rogers
Succeeded by	Office abolished
British Ambassador to Russia
In office 1 November 2011 – 1 January 2016
Monarch	Elizabeth II
Prime Minister	David Cameron
Preceded by	Anne Pringle
Succeeded by	Laurie Bristow
British Ambassador to Ukraine
In office 1 July 2006 – 2008
Monarch	Elizabeth II
Prime Minister	Tony Blair Gordon Brown
Preceded by	Robert Brinkley
Succeeded by	Leigh Turner
Personal details
Born	(1964-02-15) 15 February 1964 (age 60)
Education	Arnold Lodge School Warwick School
Alma mater	Brasenose College, Oxford

Sir Timothy Earle Barrow (born 15 February 1964) is a British diplomat who served as Permanent Representative of the United Kingdom to the European Union from 2017 to 2020 and as the British Ambassador to the European Union from 2020 to 2021. He served as National Security Adviser from 2022 to 2024.^[1]

Barrow was appointed as Permanent Representative in January 2017 following the resignation of his predecessor, Ivan Rogers, and played an important role in the United Kingdom Brexit negotiations. He was responsible on 29 March 2017 for formally invoking Article 50 of the Treaty on the European Union on behalf of the UK. When the United Kingdom left the EU on 31 January 2020, Barrow became HM Ambassador to the European Union.

Barrow has been a civil servant in the Foreign and Commonwealth Office (FCO) since 1986. He served in London, Kyiv, Moscow and Brussels before his appointment as the British Ambassador to Ukraine in 2006. In 2008, he became the Ambassador to the Western European Union and the UK Representative to the Political and Security Committee. From 2011 to 2016, he served as the British Ambassador to Russia before returning to London as the Foreign, Commonwealth and Development Office's Political Director.