Between Us is a greatest hits album by British girl group Little Mix, released on 12 November 2021 through RCA Records Described by the members as a celebration of sisterhood, friendship and fun, the announcement was made as part of the group's celebrations commemorating the 10th anniversary since their formation on the eighth series of The X Factor UK. It was supported by the release of two songs, "Love (Sweet Love)" and "No".

The recording stages of the new songs took place during COVID-19 and Little Mix members Leigh-Anne Pinnock and Perrie Edwards' pregnancies. The album peaked at number three on the UK Albums Chart and reached the top five in Ireland, Scotland and Portugal and the top ten in Spain, Netherlands and Australia. In 2021, it was one of Sony Music's top ten best-selling albums globally of that year and has been certified Platinum by the BPI, ARIA, IFPI, and Gold by RMNZ and AMPROFON. As of June 2024, the album has spent 136 weeks on the UK Albums Charts, the second longest charting album by a girl group.

The album was made available in different versions, while the standard edition consists of Little Mix's biggest hits between 2011 and 2022, including four of their five UK number-one singles, "Wings", "Black Magic", "Shout Out to My Ex" and "Sweet Melody". Their debut solo single "Cannonball", which peaked at number one in the UK, is featured on the CD deluxe edition as the final track. The standard edition of the album includes two other new tracks titled "Between Us" and "Cut You Off", both of which charted on the UK Singles Chart. A fifth new song titled "Trash" was featured on the deluxe editions of the album.