Percival Dearmer (1867–1936), known as Percy Dearmer, was an English priest and liturgist best known as the author of The Parson's Handbook, a liturgical manual for Anglican clergy.
A lifelong socialist, he was an early advocate of the public ministry of women (but not their ordination to the priesthood) and concerned with social justice.
Dearmer also had a strong influence on the music of the church and, with Ralph Vaughan Williams and Martin Shaw, is credited with the revival and spread of traditional and medieval English musical forms.
His ideas on patterns of worship have been linked to the Arts and Crafts Movement, while Dearmer and Vaughan Williams' English Hymnal has been linked to the influence of both it and Christian Socialism.
Dearmer ended his life as Canon of Westminster Abbey, from where he ran a canteen for the unemployed in the 1930s.