Phoebe Knapp (née Palmer; March 9, 1839 – July 10, 1908) was an American composer of music for hymns and an organist.

She married Joseph Fairchild Knapp, one of the founders and the second president of the Metropolitan Life Insurance Company.

[2] She and her husband were members of the John Street Methodist Episcopal Church in New York City.

The most enduring melody she composed is that of the 1873 hymn "Blessed Assurance," for which Fanny Crosby wrote the text.

[2] Knapp and Crosby also collaborated on the Palm Sunday hymn "Open the Gates of the Temple.