Thomas Stuart Francis Fletcher CMG (born 27 March 1975) is a British diplomat and writer who has served as Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator since 2024.

[1][2] He was Principal of Hertford College, Oxford, from 2020 to 2024,[3] having previously served as British Ambassador to Lebanon and a foreign affairs policy adviser at 10 Downing Street.

[4][5] Fletcher was born in Kent and educated at The Harvey Grammar School and Hertford College, Oxford, where he was awarded first class honours degree in modern history.

[17] Fletcher caused controversy by donating blood after a terrorist attack against the Iranian embassy in Beirut in 2013, and becoming a domestic worker to highlight migrant rights.

[30][3] Fletcher is the project director of Towards Global Learning Goals, a network that aims to create equal opportunities, develop the skills needed to thrive in a new economy, and make it easier for people on the move to adapt.

According to The Sunday Times[34] and a video Fletcher recorded on social media,[35] he collected a book of advice for his sons from world leaders, including Barack Obama, George W. Bush and Bill Clinton, while working for 10 Downing Street.