"Beautiful Dreamer" is a parlor song by American songwriter Stephen Foster. It was published posthumously in March 1864, by Wm. A. Pond & Co. of New York. The first edition states on its title page that it is "the last song ever written by Stephen C. Foster, composed but a few days prior to his death." However, Carol Kimball, the author of Song, points out that the first edition's copyright is dated 1862, which suggests, she writes, that the song was composed and readied for publication two years before Foster's death. There are at least 20 songs, she observes, that claim to be Foster's last, and it is unknown which is indeed his last. The song is set in 98 time with a broken chord accompaniment.

Stephen Collins Foster, known as "the father of American music", was an American composer known primarily for his parlour and minstrel music during the Romantic period. He wrote more than 200 songs, including "Oh! Susanna", "Hard Times Come Again No More", "Camptown Races", "Old Folks at Home", "My Old Kentucky Home", "Jeanie with the Light Brown Hair", "Old Black Joe", and "Beautiful Dreamer", and many of his compositions remain popular today.