The War Requiem, Op. 66, is a large-scale, non-liturgical setting of the Requiem composed by Benjamin Britten mostly in 1961 and completed in January 1962. The War Requiem was performed for the consecration of the new Coventry Cathedral, which was built after the original fourteenth-century structure was destroyed in a World War II bombing raid. The traditional Latin texts are interspersed, in telling juxtaposition, with settings of poems by Wilfred Owen, written in World War I. The work is scored for soprano, tenor and baritone soloists, chorus, boys' choir, organ, and two orchestras (a full orchestra and a chamber orchestra). The chamber orchestra accompanies the intimate settings of the English poetry, while soprano, choirs and orchestra are used for the Latin sections; all forces are combined in the conclusion. The Requiem has a duration of approximately 90 minutes.

The War Requiem, first performed on 30 May 1962, was commissioned to mark the consecration of the new Coventry Cathedral, which was built after the original fourteenth-century structure was destroyed in a World War II bombing raid. The reconsecration was an occasion for an arts festival, for which Michael Tippett also wrote his opera King Priam.

Britten, a pacifist, was inspired by the commission, which gave him complete freedom in deciding what to compose. He chose to set the traditional Latin Mass for the Dead interwoven with nine poems about war by the English poet Wilfred Owen. Owen, who was born in 1893, was serving as the commander of a rifle company when he was killed in action on 4 November 1918 during the crossing of the Sambre-Oise Canal in France, just one week before the Armistice. Although he was virtually unknown at the time of his death, he has subsequently come to be revered as one of the great war poets.

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