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Dame Karen Elizabeth Pierce (born 23 September 1959) is a British diplomat who served as British Ambassador to the United States from March 2020 to February 2025. She was previously the Permanent Representative of the United Kingdom to the United Nations from 2018 to 2020 and the British Ambassador to Afghanistan from 2015 to 2016. She was the first woman appointed to the United States and United Nations roles, and the second in the Afghanistan role.
| Diplomatic posts | ||
| Preceded byPeter Gooderham | British Permanent Representative to the United Nations in Geneva 2012–2015 | Succeeded byJulian Braithwaite |
| Preceded bySir Richard Stagg | British Ambassador to Afghanistan 2015–2016 | Succeeded byDominic Jermey |
| Preceded byMatthew Rycroft | British Permanent Representative to the United Nations 2018–2020 | Succeeded byDame Barbara Woodward |
| Preceded byKim Darroch | British Ambassador to the United States 2020–2025 | Succeeded byPeter Mandelson |