"Diary" is a song by American singer-songwriter Alicia Keys from her second studio album, The Diary of Alicia Keys (2003). Written by Keys and Kerry Brothers, Jr. and produced by Keys, the song features the American group Tony! Toni! Toné! on bass, piano, guitar, organ and Wurlitzer, while Jermaine Paul provides uncredited additional vocals. It was released on May 24, 2004, as the album's third single. At one time, "Diary" had been released as a double A-side with "If I Ain't Got You".[2]

"Diary" was nominated for Best R&B Performance by a Duo or Group with Vocals at the 2005 Grammy Awards. The song peaked at number eight on the Billboard Hot 100 and number two on the Hot R&B/Hip-Hop Songs. Its Hani remixes topped the Hot Dance Club Play chart in late 2004. The song's lyrics tell listeners that they can reach Keys by calling a particular number, 489–4608, which was her former telephone number minus the area code when she lived in New York City, according to Keys' publicist, Lois Najarian. Callers who used the correct code (347) would have received a voicemail from Keys herself. However, after listening to the song, fans tried calling the number with different area codes, and one of them, 912, turned out to be the number of a retired pastor from Statesboro, Georgia, named J.D. Turner. He claims to have received more than twenty calls a day from Keys' fans in the weeks after the song's release.[4] This led to a $95 phone bill resulting from charges associated with the *69 last-call return option, which he used to track down each caller. Turner has declined to change his number, having held it for fourteen years before the song's release.[5][6] As of 2015, the number in the 347 area code is no longer in service and Turner retained it in the 912 code until his death in 2019.