2001 (also referred to as The Chronic 2001 or The Chronic II) is the second studio album by American rapper and producer Dr. Dre. It was released on November 16, 1999, by Aftermath Entertainment and Interscope Records as the follow-up to his 1992 debut album, The Chronic. The album was produced mainly by Dr. Dre and Mel-Man, as well as Lord Finesse, and features several guest contributions from Hittman, Snoop Dogg, Kurupt, Xzibit, Eminem, and Nate Dogg.

2001 exhibits an expansion on Dre's debut G-funk sound and contains gangsta rap themes such as violence, crime, promiscuity, sex, drug use, and street gangs. The album debuted at number 2 on the U.S. Billboard 200 chart, selling 516,000 copies in its first week. It produced three singles that attained chart success and has been certified 6× Platinum by the Recording Industry Association of America (RIAA); as of August 2015 the album has sold 7,800,000 copies in the United States. 2001 received generally positive reviews from critics, many of whom praised the production and music, although some found the lyrics objectionable.