Whatever People Say I Am, That's What I'm Not is the debut album by Sheffield band Arctic Monkeys, released on 23 January 2006. The band recorded the album in a studio at Chapel Studio, Lincolnshire, in September 2005 before embarking on their first world tour. The album became the fastest selling debut album in the UK since records began, selling over 360,000 copies.

The album includes both tracks from the band's original EP, Five Minutes with the Arctic Monkeys, as well as their first two singles and UK Number Ones, "I Bet You Look Good On the Dancefloor" and "When The Sun Goes Down".

The original release date was scheduled as 30 January 2006, but was brought forward to 23 January 2006 due to "high demand". Although the same was done with Franz Ferdinand, there remains continued speculation that the move attempts to counter the effects of the album's leak and online file-sharing. Many of the tracks featured on the album were freely available to download in early 2005 from uploaded demo CDs given out by the band, but nonetheless all the re-recorded album versions had been leaked onto the internet by December 2005.

On the first day of its release, the album became the fastest selling debut rock album in British history, selling just under 120,000 copies. This figure meant more copies were sold in 24 hours than the former record holder - Oasis' Definitely Maybe, sold in a week. By the end of the week, the album had sold 363,735 copies - more than the rest of the Top 20 combined - and broke Hear'say's 2001 record for the fastest selling debut album.

Its release in the United States on 21 February 2006 saw it become the second fastest selling debut indie album in history, turning over around 34,000 copies in its first week and achieving #24 in the album charts. The album also went to #1 in Australia.