Before the album was released, it was reported by
Official Charts Company that at the midweek stage, Little Mix and Taylor Swift were contenders for the number-one spot. It was branded by some to be one of the closest chart battles to happen so far in the UK that year with a nine sale difference between the albums. On the
UK Albums Chart, the album debuted at number four, selling 33,822 copies in its first week, becoming the group's seventh top-five album there.
Between Us, was named as the twelfth biggest-selling cassette of 2021. On April 29, 2022, the album reached a new peak of number three after 24 weeks on the charts. As of June 2022, the album surpassed over 109,000 streams in the UK. On 11 November 2022, it became Little Mix first album since
Glory Days (2016) to spend a full year on the UK Official Albums; becoming the fourteenth album by a girl group to achieve this. Outside of the United Kingdom, the album debuted at number two on the
Irish Albums Chart, becoming the group's seventh consecutive top ten album in Ireland. It missed out on the number one album spot to Taylor Swift's Red (Taylor's Version). On April 15, after
The Confetti Tour,
Between Us re-entered the official top ten albums charts at number three, spending 14 weeks inside the top ten of the charts there.
Between Us, reached number three in Portugal and Scotland and reached the top ten in Australia, Spain and the Netherlands. It also reached the top twenty in Belgium and New Zealand, the top thirty in Germany and the top forty in Austria, Italy and Poland. It also charted in other countries such as Japan, Canada and in the United States. By the end of 2021, Little Mix was named as one of three UK acts to be featured on the top-ten best selling albums from
Sony Music Entertainment. In July 2022, the album was named as the fifth biggest selling album so far in the UK, selling over 119,000 copies and becoming the biggest selling album there by a group. It finished as the ninth best-selling album of 2022 in the United Kingdom and has since been certified Platinum there. It was also certified Platinum in Australia and Switzerland, and Gold in Mexico. As of August 22, 2025, the album spent a total of 194 weeks in the UK charts.
Year-end lists ==Track listing==