1 is a compilation album by the English rock band the Beatles, originally released on 13 November 2000. The album features virtually every number-one single the band achieved in the United Kingdom and United States from 1962 to 1970. Issued on the 30th anniversary of the band's break-up, it was their first compilation available on only one CD. 1 was a commercial success and topped the charts worldwide. It has sold over 31 million copies.

In addition, 1 is the fourth best-selling album in the US since Nielsen SoundScan began tracking US album sales in January 1991 and the best-selling album of the decade (2000 to 2009) in the US, as well as the best-selling album of the decade worldwide. 1 was remastered and reissued in September 2011, and was remixed and reissued again in several different deluxe editions in November 2015, the most comprehensive of which is a three-disc set entitled 1+, which includes video discs of the band's music videos.

As of June 2015, 1 is the sixth best-selling album of the 21st century in the UK, having sold over 3.1 million copies.

Compiled by producer George Martin and the (then) three surviving members of the band,1 includes the 27 Beatles songs that went to number one in the United Kingdom on the Record Retailer Top 50 chart or in the United States on the Billboard Hot 100 chart. It is worth noting, however, that the song "For You Blue" was listed on Billboard chart at number 1, along with the A-side "The Long and Winding Road", but Capitol Records treated "For You Blue" as strictly a B-side and did not promote it as an A-side. Meanwhile, "Day Tripper" was included on 1, since it charted at number 1 in the UK as a double A side with "We Can Work It Out", while in the US, only "We Can Work It Out" was number 1. Two notable singles released in both the UK and US that did not reach number 1 in either country, and were therefore ineligible for inclusion on the album, were "Please Please Me" and "Strawberry Fields Forever" (both reached number 2 in the UK charts, while in the US the former peaked at number 3, and the latter at number 8). The former was largely known as "The Beatles' first UK number one single"; however, it reached the top spot in the musical magazines New Musical Express and Melody Maker but not on the chart published by Record Retailer (now Music Week). On the other hand, "Strawberry Fields Forever" was part of a double A-side single along with "Penny Lane". This single had peaked at number 2 in the charts, behind Engelbert Humperdinck's single "Release Me".

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