The Diary of Alicia Keys is the second studio album by American recording artist Alicia Keys. It was released in the United States on December 2, 2003 by J Records. Recording sessions for the album took place during 2002 to 2003 at various recording studios, and production was handled primarily by Keys with contributions from Kerry Brothers, Jr., Timbaland, Dwayne Wiggins, Dre & Vidal, Easy Mo Bee and Kanye West.

The album debuted at number one on the US Billboard 200 chart, selling 618,000 copies in its first week. It became Keys' second consecutive number-one debut in the United States and spawned three top-ten singles. Upon its release, The Diary of Alicia Keys received generally positive reviews from most music critics and earned Keys three Grammy Awards at the 47th Grammy Awards. With domestic sales of four million copies and worldwide sales of eight million copies, The Diary of Alicia Keys is the thirty-first best-selling album of the 2000s (decade).