Certification levels have been used for most countries, but certification was not common until the late 1970s in the US and UK, and later in other countries.In addition, in many countries certification is for shipments of a record to retailers, rather than actual sales.

A girl group is a popular music act featuring several female singers who generally harmonize together.

Girl groups have been popular at least since the heyday of the Boswell Sisters beginning in the 1930s, but the term "girl group" also denotes the wave of American female pop singing groups who flourished in the late 1950s and early 1960s between the decline of early rock and roll and the British Invasion, many of whom were influenced by doo-wop style.

This article covers only girl groups from that era and later.

Sales figures records in most countries are not available before the 1990s, so it is difficult to accurately determine best-selling records, either by country or worldwide.

It is extremely difficult to obtain worldwide sales figures for singles due to the lack of verifiable sales reporting in many countries.

The best-selling single of all time by a female group is thought to be the 1977 hit "Yes Sir, I Can Boogie" by Spanish group Baccara, with estimated sales of between 16 and 18 million copies worldwide."Suzukake no Ki no Michi de "Kimi no Hohoemi o Yume ni Miru" to Itte Shimattara Bokutachi no Kankei wa Dō Kawatte Shimau no ka, Bokunari ni Nannichi ka Kangaeta Ue de no Yaya Kihazukashii Ketsuron no Yō na Mono" Certifications according to Recorded Music NZ.

Since November 2014 certifications for singles have included streaming, and therefore cannot be compared to certifications from before this date.

Certifications based on sales only There were few certifications awarded in Sweden before 1996, so singles before this date are not represented in this list.

There have been three different certification levels since 1996: from 1996 to June 2003 the gold/platinum levels for singles were 15,000/30,000, from July 2003 to September 2010 the levels were 10,000/20,000, and from October 2010 onwards, when streaming was included in the certification levels, the levels have been 20,000/40,000.