William Henry Monk (1823–1889) was an English composer, musician, and music editor, primarily known for his contributions to hymnody and sacred music. He belonged to the 19th-century choral and hymn music genre, significantly influencing the development of congregational singing in the Anglican church. Monk is best known for composing the popular hymn tune "Eventide," which accompanies the text of "Abide with Me," a hymn authored by Henry Francis Lyte. This tune remains a staple in church services and is celebrated for its emotive melody. In addition to "Eventide," Monk composed various other hymn tunes and contributed to the compilation of hymnals, including the influential "Hymns Ancient and Modern," which helped standardize hymn singing in English churches. His work was pivotal in the Victorian era's revival of church music, emphasizing accessibility and congregational participation. Monk's legacy is seen in the continued popularity of his hymns and his role in shaping modern hymnody, making him a significant figure in the history of sacred music.