Greatest Hits is A-Teens' last album. It is a compilation including their biggest worldwide hits, such as "Mamma Mia", "Upside Down", "Halfway Around the World", "Floorfiller", and many others. Every track included on the album reached the Top 20 in at least one country.

A-Teens are a Swedish pop music group from Stockholm. The group was formed by Niklas Berg in 1998 as an ABBA tribute group called ABBA-Teens, which was later renamed A-Teens. The band members were Marie Serneholt, Amit Paul, Dhani Lennevald, and Sara Lumholdt. The group is best known for the singles "Mamma Mia" (1999) and "Upside Down" (2000), both of which were hits worldwide. The group was particularly successful in their home country where they amassed ten top 10 hit singles on the Swedish charts.