The Three Choirs Festival is a music festival held annually at the end of July, rotating among the cathedrals of the Three Counties (Hereford, Gloucester and Worcester) and originally featuring their three choirs, which remain central to the week-long programme. The large-scale choral repertoire is now performed by the Festival Chorus, but the festival also features other major ensembles and international soloists. The 2011 festival took place in Worcester from 6 to 13 August. The 2012 festival in Hereford took place earlier than usual, from 21 to 28 July, to avoid clashing with the 2012 Summer Olympics. The event is now established in the last week of July. The 300th anniversary of the original Three Choirs Festival was celebrated during the 2015 festival, which took place from 25 July to 1 August in Hereford (the landmark 300th meeting of the Three Choirs does not fall until after 2027 due to there being no Three Choirs Festivals for the duration of both World War I and World War II and COVID-19. The 2023 Festival will take place in Gloucester from 22 to 29 July.

The festival is closely identified with the musical careers of British composers Edward Elgar and Ralph Vaughan Williams. The organists of the three cathedrals (who act as artistic director and festival conductor when it is their cathedral's turn to host the festival) are Geraint Bowen (Hereford), Adrian Partington (Gloucester) and Samuel Hudson (Worcester).