Let Go is the debut album by Canadian singer-songwriter Avril Lavigne, released on 4 June 2002. For a year after signing a record deal with Arista, Lavigne struggled due to conflicts in musical direction. Lavigne relocated to Los Angeles, California, and recorded there, her earlier materials for the album; the kind of sound to which the label was not amenable. She was paired to the production team The Matrix, who understood her vision for the album.

The album was credited as the biggest pop debut of 2002, and was 6x platinum in the United States. It was released to generally positive critical reviews, although Lavigne's songwriting received some criticism. It also did extremely well in Canada, receiving a diamond certification from the Canadian Recording Industry Association, as well as reaching multi-platinum in many countries around the world, including the UK in which she became the youngest female solo artist to have a number-one album in the region.

As of 2013, Let Go had sold over 20 million copies worldwide, becoming Lavigne's highest-selling album to date. According to Billboard magazine, the album was the number 21 top-selling album of the decade. A Rolling Stone readers poll named Let Go as the fourth best album of the 2000s.

On 18 March 2013, Let Go was re-released as a double disc-set paired with her second studio album, Under My Skin, which is released under RCA Records.