United Kingdom in the Eurovision Song Contest 2021

The United Kingdom was represented at the Eurovision Song Contest 2021 with the song "Embers" written by James Newman, Conor Blake, Danny Shah, Tom Hollings, and Samuel Brennan, and performed by Newman himself. The British participating broadcaster, the British Broadcasting Corporation (BBC), internally selected both the song and the performer, after Newman was due to compete in the 2020 contest with "My Last Breath" before the event's cancellation. Newman was announced as the British entrant on 19 February 2021, while the song "Embers" was presented to the public on 11 March 2021.

As a member of the "Big Five", the United Kingdom automatically qualified to compete in the final of the Eurovision Song Contest. Performing in position 9, the United Kingdom placed 26th (last) out of the 26 participating countries, failing to score any points. This was the fifth time the nation had placed last in the history of the competition, and the second time the nation received nul points. The United Kingdom was also the first country to have received nul points since the implementation of the new system in 2016.