"The One I Love (Belongs to Somebody Else)" is a popular song.
The music was written by Isham Jones, the lyrics by Gus Kahn. The song was published in 1924. It was first introduced by Al Jolson. The song was performed in the 1951 film I'll See You in My Dreams, starring Doris Day and Danny Thomas. The film was based loosely upon the lives of Gus Kahn and his wife Grace LeBoy Kahn.
Frank Sinatra covered the song on his 1961 album I Remember Tommy.