"Don't Forget About Us" is a song by American singer and songwriter Mariah Carey. It was written by Carey, Jermaine Dupri, Bryan-Michael Cox and Johntá Austin, and released as the fifth single on December 12, 2005, for the re-issue of her tenth studio album, The Emancipation of Mimi (2005). Co-produced by the former three, the song is influenced by R&B and hip hop soul music genres, and lyrically chronicles the emotions felt by the protagonist after the loss of their relationship. Carey explained that the true meaning of the song is to be interpreted by the listener, therefore not disclosing its entire meaning publicly.

The song received generally positive reviews from music critics, with many heavily comparing it to Carey's previous single "We Belong Together". Several reviewers felt the song's similarity marked Carey's lack of creativity with it, while others embraced its radio-friendly formula. "Don't Forget About Us" became Carey's seventeenth chart topping single on the US Billboard Hot 100, tying the record for most number-one singles by a solo artist set by Elvis Presley 36 years before. Internationally, the song topped the singles chart in Belgium and Finland, and reached the top-ten in Hungary and the Netherlands.

Carey performed the song at the 33rd annual American Music Awards, and during the half-time of the Thanksgiving game between the Detroit Lions and the Atlanta Falcons. Additionally, the song was included on the set-lists of Carey's The Adventures of Mimi and Angels Advocate Tours. The song's music video chronicles the two time frames, Carey in the present, as well as the past memories she shared with her ex-lover that continue to haunt her. At the 49th annual Grammy Awards, "Don't Forget About Us" was nominated for two awards during the ceremony held on February 11, 2007.

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