Dido's Lament is the aria "When I Am Laid in Earth" from the opera Dido and Aeneas by Henry Purcell (libretto by Nahum Tate).

It is included in many classical music textbooks on account of its exemplary use of the passus duriusculus (a melody or melodic fragment spanning a perfect fourth with all or almost all chromatic intervals filled in) in the ground bass.

The conductor Leopold Stokowski wrote a transcription of the piece for symphony orchestra. It is played annually in London by the massed bands of the Guards Division at the Cenotaph remembrance parade in Whitehall on Remembrance Sunday, the Sunday nearest to November 11 (Armistice Day).