The Golden Ratio is the fifth album by Swedish pop music group, Ace of Base. It was recorded in late 2009 through mid-2010. It is the first album to feature two new vocalists: Clara Hagman and Julia Williamson. Production on a fifth album initially began with former band member and lead vocalist, Jenny Berggren in which the resulting sessions were shelved.
The Golden Ratio marks the band's first album of completely new material since their 2002 album, Da Capo. The album entered the German album charts at number 20 and at number 100 in Switzerland.
The band have said of the album “The Golden Ratio” is the end result of three years of work in the studio for Ulf and Jonas. Their main challenge was to find what the Ace of Base sound would be in the second decade of the twenty-first century. After a year of experimenting, they realized they wanted to embrace and preserve the original Ace of Base sound and make it contemporary at the same time." 
The Golden Ratio received mostly positive reviews from critics. Rock&Review gave the album a positive review, stating, "Sonically, The Golden Ratio is everything you expect in an Ace of Base album and it's quite hard to tell that Jonas Berggren's sisters are absent as the new vocalists do a great job of filling in where Malin and Jenny left off."
ScandiPop also gave the album very high praise, saying "It’s a jaw droppingly good album. They’ve gone back to everything that made them so brilliant when they first started out in the early nineties."