"Diary" is a song by American recording artist Alicia Keys from her second studio album, The Diary of Alicia Keys. Written by Keys and Kerry Brothers, Jr., the song features the American group Tony! Toni! Toné!, and was released on June 29, 2004 as the album's third single. It was nominated for Best R&B Performance by a Duo or Group with Vocals at the 2005 Grammy Awards.

At one time, "Diary" had been released as a double A-side with "If I Ain't Got You". The song's Hani remixes gave Keys her first—and so far only—chart-topper on the Hot Dance Club Play in late 2004. It also peaked at number eight on the Billboard Hot 100 and number two on the Hot R&B/Hip-Hop Songs. Keys and Tony! Toni! Toné!, never sang the song live together, to date.

In the song, the narrator invites a man who she is close with to trust her and confide his secrets in her ("just think of me as the pages in your diary").

The production of the song got positive reviews. Mark Anthony Neal of Pop Matters wrote "The sparse production of the title track “Diary”, which features Tony! Toni! Tone!, gives Keys ample space to work out her ideas."

The single's music video, directed by Lamont "Liquid" Burrell, Rod Isaacs, Jeff Robinson, and Brian Campbell, contains footage of several live concerts from both 2004's Verizon Ladies First Tour, which Keys took part in, and her own 2005 The Diary Tour. Tony! Toni! Toné! does not appear in the video, and their parts are instead performed by Jermaine Paul, but he was not credited with being just a backing vocal Keys.

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