Smith Gaynor (February 17, 1863 - February 20, 1921) was an American composer of children's music.
She wrote the music for the well-known children's lullaby, "The Slumber Boat", in collaboration with the children's author, Alice C.D.
Riley, who wrote the lyrics.Her daughter, Rose Gaynor Barrett (1884-1954), was an American visual artist as well as songwriter under her maiden name, Rose Fenimore Gaynor.