Morgan McSweeney

Morgan McSweeney
Downing Street Chief of Staff
Assumed office
6 October 2024
Prime MinisterKeir Starmer
Deputy
  • Vidhya Alakeson
  • Jill Cuthbertson
Preceded bySue Gray
Head of Political Strategy
10 Downing Street
In office
5 July 2024  6 October 2024
Serving with Paul Ovenden
Prime MinisterKeir Starmer
Preceded byOffice established
Director of Campaigns to the Leader of the Opposition
In office
September 2022 (2022-09)  5 July 2024
LeaderKeir Starmer
Preceded byOffice established
Chief of Staff to the Leader of the Opposition
In office
4 April 2020 (2020-04-04)  20 June 2021 (2021-06-20)
LeaderKeir Starmer
Succeeded bySam White
Personal details
Born (1977-04-19) 19 April 1977
Macroom, County Cork, Ireland
Political partyLabour
SpouseImogen Walker
Children1
EducationMiddlesex University

Morgan McSweeney (born 1977) is an Irish-born political strategist based in the United Kingdom. He has served as Downing Street Chief of Staff under Prime Minister Keir Starmer since October 2024. McSweeney was the campaign manager for the Labour Party and director of think tank Labour Together.

McSweeney built a reputation as a Labour organiser, leading successful campaigns to win a majority on the Lambeth London Borough Council and to defeat the far-right British National Party in Barking and Dagenham. In 2017, he became Labour Together director during the Labour Party leadership of Jeremy Corbyn, where he worked to replace Corbyn and to reduce left-wing influence in the party. In 2020, he led Starmer's successful Labour leadership campaign and subsequently led Labour's successful campaign in the 2024 general election.

In June 2024, The New Statesman ranked McSweeney first on a list of the most influential progressive figures in the UK, having described him as Starmer's "most trusted aide". In October 2023, The Times stated that "nobody without elected office wields as much power in British politics as McSweeney".