Roger Cuthbert Quilter (1 November 1877 – 21 September 1953) was an English composer, known particularly for his songs.

Roger Quilter's output of songs, more than one hundred in total, added to the canon of English art song that is still sung today. Among the most popular are "Love's Philosophy", "Fair House of Joy", "Come Away Death", "Go, Lovely Rose", "Weep You No More", "By the Sea", and his setting of "O Mistress Mine". Quilter's setting of verses from the Tennyson poem "Now Sleeps the Crimson Petal" is one of his earliest songs but is nonetheless characteristic of the later, mature style.

He also published the Arnold Book of Old Songs, a collection of 16 folk and traditional songs to new accompaniments, dedicated to his nephew Arnold Guy Vivian.