Thomas Stuart Francis Fletcher CMG (born 27 March 1975) is a British diplomat and writer who has served as the United Nations Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator since 2024.The Guardian, "Former foreign policy adviser to three UK PMs appointed as UN aid chief", 9 October 2024. Retrieved 11 October 2024.United Nations, "Mr. Tom Fletcher of the United Kingdom – Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator", 9 October 2024. Retrieved 11 October 2024.
He was Principal of Hertford College, Oxford, from 2020 to 2024,University of Oxford, Hertford College, "An Announcement from the Principal", 9 October 2024. Retrieved 11 October 2024. having previously served as British Ambassador to Lebanon and a foreign affairs policy adviser at 10 Downing Street.
Early life and education Fletcher was born in Kent and educated at The Harvey Grammar School and Hertford College, Oxford.
Diplomatic career Early roles Fletcher joined the Foreign and Commonwealth Office and held diplomatic posts in Nairobi and Paris, and is the co-founder of 2020 (a progressive think tank). He was also private secretary to the Foreign and Commonwealth Office ministers Baroness Amos and Chris Mullin. While in Kenya, he took part in a charity boxing match with the mayor of Nairobi, who had t-shirts printed saying "Fletcher goes home on a stretcher".
Between 2007 and 2011, Fletcher was a foreign policy and Northern Ireland adviser to prime ministers Tony Blair, Gordon Brown and David Cameron. In his memoirs, Brown called him "indispensable and indefatigable". In his book For the Record, Cameron wrote: "There was one man who would prove essential: Tom Fletcher. Tom became my support, sounding board and source of information about virtually every country on Earth."
Ambassador to Lebanon From 2011 to 2015 Fletcher served as British Ambassador to Lebanon, where he tweeted and wrote blogposts (Dear Lebanon and Yalla Bye). He said: "The smartphone from which I tweet is also the device which terrorists can use to track me. For security reasons I always have to tweet from the car on the way to the next place. If I tweet from the place I am, I have to leave immediately." The BBC made a documentary, The Naked Diplomat, about his work, which involved initiatives on refugee education, job creation and border security.
In partnership with the Banque du Liban, Fletcher led the launch of the UK Lebanon Tech Hub, an international accelerator using London as a platform for Lebanese technology businesses to grow internationally. By December 2018, the hub had helped to grow 91 start-ups, raising more than $64 million in venture funding and creating more than 2,000 jobs in Lebanon and the United Kingdom.
Fletcher donated blood after a terrorist attack against the Iranian embassy in Beirut in 2013.
Arab News described him as "the anti-diplomat" because of his steadfast refusal to live up to the stereotype expected of the ambassadorial profession. He was commended by many commentators for his viral online farewell, which resurrected the old Foreign and Commonwealth Office tradition of the valedictory despatch. In December 2015 he was given the Lovie Special Achievement awardhttps://www.lovieawards.eu/features/top-moments-at-the-5th-annual-lovie-awards/ for his use of social media while serving in Lebanon.
Principal of Hertford College, Oxford Fletcher was elected Principal of Hertford College in November 2019 and took up the post in 2020. His association with Hertford spanned three decades, from his time as an undergraduate to his return as Principal. At the time of appointment, he was noted to be the youngest serving head of an Oxford college and the youngest ever Principal of Hertford.
As Principal, Fletcher linked his diplomatic background to higher education, describing education as “upstream diplomacy”. Fletcher characterised Hertford as a college shaped by “unpretentious mischief”, argument and opportunity. His tenure was associated with Hertford 2030, the college’s strategic vision around academic excellence, access, sustainability, opportunity, community and citizenship, and world-class facilities. In Hertford, Fletcher also served as Vice Chair of Oxford University’s Conference of Colleges in 2023/24. He oversaw the establishment of the Asseily Scholarship for a student displaced by conflict, persecution, or deprivation, as well as the Sibusiso Scholarship for five African graduate students.
In his farewell message, Fletcher described Hertford College as "more than a building, but a community" and "more than the portraits that tell us who we've been, we're the glass ceiling breakers of the future who will show us who we can be". During his final year, Fletcher highlighted Hertford’s access, sustainability and capital-development agenda, including plans for a new library, graduate centre, roof terrace and café. Hertford described the library project as a once-in-a-generation redevelopment intended to expand study space, improve accessibility and provide a new ‘rare books and archives’ facility.
UN Humanitarian Chief and Emergency Relief Coordinator On 9 October 2024, United Nations Secretary-General António Guterres appointed Fletcher as Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator, succeeding Martin Griffiths. He took office on 18 November 2024. As Emergency Relief Coordinator, he heads the United Nations Office for the Coordination of Humanitarian Affairs (OCHA) and chairs the Inter-Agency Standing Committee (IASC), the principal humanitarian coordination forum bringing together United Nations agencies and major humanitarian organisations. He was the sixth Briton in a row to hold the role, despite efforts by some countries to have the United Nations Secretary-General, appoint someone of a different nationality.
Fletcher’s appointment coincided with a marked contraction in global funding for humanitarian response alongside rising global need. Fletcher repeatedly linked the deterioration in humanitarian response capacity to donor retrenchment and the politicisation of aid. In February 2025, he discussed the consequences of United States foreign aid cuts in an interview with Sarah Montague for the BBC World Service. In March, appearing on Talk to Al Jazeera, he warned that funding reductions, political obstruction and increasing danger for aid workers were constraining humanitarian operations amid escalating crises.
Appearing on The Rest Is Politics: Leading Podcast with Alastair Campbell and Rory Stewart, Fletcher described his job as being akin to a driver of an "ambulance towards the fire" while also being asked to extinguish it without sufficient resources and while facing attacks on humanitarian personnel. The metaphor captured his wider argument that humanitarian organisations were being asked to respond to growing wars and disasters while their resources and protection were simultaneously being eroded. In public statements, Fletcher repeatedly describes humanitarian action as operating in an increasingly hostile political environment.
In March 2025, Fletcher launched what he termed the ''Humanitarian Reset'' through the Inter-Agency Standing Committee (IASC). The initiative was presented as a response to declining resources, reduced political support for humanitarian action and pressure on humanitarian organisations. Its stated direction included stronger prioritisation of life-saving assistance, simplified coordination arrangements, greater authority at country level and efforts to direct more resources to local and national responders. In his statement announcing the initiative, he said that the humanitarian system was "underfunded, overstretched and under attack", and that humanitarian organisations would "prioritize robustly, and make the toughest choices". The latter is in reference to reduced funding which, according to the United Nations, had forced humanitarian organisations to limit whom they could assist and focus on the most of the most vulnerable. On the question of reform of the United Nations, Fletcher also argued that reform should not be about protecting institutions: the system needed to devolve power, listen more seriously to people affected by crises and defend the principles of international solidarity on which humanitarian action depends. In Le Monde, he quipped “anyone who says the UN is dead should spend some time with my colleagues in Sudan or DRC”
The consequences of the funding contraction were immediate. In April 2025, Fletcher announced that his own office (OCHA) would reduce its workforce by approximately 20 per cent. The Humanitarian Reset agenda also generated criticism from organisations outside the United Nations. The New Humanitarian reported that representatives of local and national organisations considered consultation inadequate and said they lacked meaningful participation in decisions affecting the future architecture of humanitarian response.
By December 2025, the funding contraction had forced a substantially narrower appeal. Fletcher had launched a prioritised 2026 global humanitarian appeal seeking US$23 billion to assist 87 million whose lives were considered at greatest risk, although around 250 million people were assessed as requiring urgent assistance. It represented the scale of the choices imposed by falling funding. Fletcher subsequently launched the “87 Million Lives” campaign in support of the appeal. The Stimson Center later described the campaign as an example of how OCHA’s fundraising efforts could contribute to a more visible, dynamic and effective United Nations.
With time, the relationship with the United States subsequently became more complex than a simple story of withdrawal. On 29 December 2025, the United States announced a US$2 billion contribution to OCHA-managed humanitarian funds under an arrangement associated with the Humanitarian Reset. On 14 May 2026, it announced a further US$1.8 billion for humanitarian pooled funds and prioritised life-saving assistance, bringing total United States support under this arrangement to US$3.8 billion across 21 countries and the Central Emergency Response Fund. The contribution announcements were significant, however, they came amid broader United States reductions in foreign assistance. The Associated Press reported that the US$3.8 billion remained a fraction of historical United States humanitarian contributions and that wider cuts had already led humanitarian organisations to reduce projects, spending and staffing.
Gaza became a prominent feature of Fletcher’s public advocacy. He repeatedly called for unrestricted humanitarian access and criticised Israeli restrictions on aid delivery. In May 2025, he rejected an Israel-initiated and United States-backed alternative aid distribution mechanism, arguing before the Security Council that it would displace people further and subordinate humanitarian assistance to political and military objectives. Israel and the United States said alternative arrangements were needed to prevent Hamas from diverting aid.