Percival Dearmer (1867–1936) was an English Anglican priest and liturgist best known as the author of The Parson's Handbook, a liturgical manual for Anglican clergy, and as editor of The English Hymnal. A lifelong socialist, he was an early advocate of the public ministry of women and concerned with social justice. Dearmer, with Ralph Vaughan Williams and Martin Shaw, helped revive and spread traditional and medieval English musical forms. His ideas on patterns of worship have been linked to the Arts and Crafts Movement, while The English Hymnal reflects both folkloric scholarship and Christian Socialism. At his death, he was a canon of Westminster Abbey, where he ran a canteen for the unemployed.

The English Hymnal is a hymn book which was published in 1906 for the Church of England by Oxford University Press. It was edited by the clergyman and writer Percy Dearmer and the composer and music historian Ralph Vaughan Williams, and was a significant publication in the history of Anglican church music.