"Unforgettable" is a popular song written by Irving Gordon. The song's original working title was "Uncomparable". The music publishing company asked Gordon to change it to "Unforgettable". The song was published in 1951.

The most popular version of the song was recorded by Nat King Cole in 1951, with an arrangement written by Nelson Riddle.  A non-orchestrated version of the song recorded in 1952 is featured as a bonus track on the CD reissue of 1955's completely instrumental (save the bonus material) Penthouse Serenade. Cole recorded the tune anew in 1961, in a stereo version of the Riddle arrangement, for the album The Nat King Cole Story.

In 1991, after Elvis Presley's musical director Joe Guercio had the idea, Cole's original 1951 recording of the song was edited and remixed to create a duet with his daughter, Natalie, which won three awards at the Grammy Awards of 1992: Song of the Year, Record of the Year and Best Traditional Pop Vocal Performance.

Nat Cole's original recording was inducted into the Grammy Hall of Fame in 2000.

Natalie Maria Cole (February 6, 1950 – December 31, 2015) was an American singer, songwriter, and performer. The daughter of Nat King Cole, Natalie rose to musical success in the mid–1970s as an R&B artist with the hits "This Will Be", "Inseparable", and "Our Love". After a period of failing sales and performances due to a heavy drug addiction, Cole re-emerged as a pop artist with the 1987 album Everlasting and her cover of Bruce Springsteen's "Pink Cadillac". In the 1990s, she re-recorded standards by her father, resulting in her biggest success, Unforgettable... with Love, which sold over seven million copies and also won Cole numerous Grammy Awards. She sold over 30 million records worldwide.

Nathaniel Adams Coles (March 17, 1919 – February 15, 1965), known professionally as Nat King Cole, was an American singer who first came to prominence as a leading jazz pianist. He was widely noted for his soft, baritone voice, which he used to perform in big band and jazz genres and which he used to become a major force in popular music for three decades, producing many hit songs.

Cole was one of the first African Americans to host a national television variety show, The Nat King Cole Show, and has maintained worldwide popularity since his death from lung cancer in February 1965.

Unforgettable, that's what you are
Unforgettable, though near or far
Like a song of love that clings to me
How the thought of you does things to me
Never before has someone been more
Unforgettable in every way
And forevermore (and forevermore)
That's how you'll stay (that's how you'll stay)
That's why darling, it's incredible
That someone so unforgettable
Thinks that I am unforgettable too

[Musical interlude]

No, never before has someone been more
Ooh unforgettable (unforgettable)
In every way (in every way)
And forevermore (and forevermore)
That's how you'll stay (that's how you'll stay)
That's why darling it's incredible
That someone so unforgettable
Thinks that I am unforgettable too.