"The Last to Know" is a song recorded by Sheena Easton for her 1987 album, No Sound But a Heart. It was written by Brock Walsh and Phil Galdston and produced by Nick Martinelli. In 1990, it was covered by Celine Dion.

Canadian singer Celine Dion covered "The Last to Know" for her first English-language album, Unison (1990). The song was released by Columbia Records as the album's fourth single in Canada on 11 March 1991. Later, it was issued as a single in the rest of the world. The song was written by Brock Walsh and Phil Galdston, and originally recorded by Sheena Easton in 1987. Dion's version was produced by Christopher Neil.

After its release, "The Last to Know" received positive reviews from music critics. The song peaked at number sixteen in Canada and number seven on the Canadian Adult Contemporary chart. It also reached number twenty-two on the US Hot Adult Contemporary Tracks. The accompanying music video for the song was directed by Dominic Orlando. Dion performed "The Last to Know" during her Unison Tour.

"The Last to Know" was one of three covers recorded by Dion for her English-language album, Unison. Dion's version was produced by British record producer, Christopher Neil. It was released as the fourth single in Canada on 11 March 1991 and third single in the United States (June 1991) and the rest of the world (September 1991). In the United Kingdom, it was the second single, after "Where Does My Heart Beat Now." "The Last to Know"'s B-side included "Unison" (Remix) in the United States and the album version of "Unison" in the rest of the world.

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