"How Deep Is Your Love" is a pop ballad written and recorded by the Bee Gees in 1977 and released as a single in September of that year. It was ultimately used as part of the soundtrack to the film Saturday Night Fever. It was a number-three hit in the United Kingdom and Australia. In the United States, it topped the Billboard Hot 100 on 25 December 1977 and stayed in the Top 10 for 17 weeks. It spent six weeks atop the US adult contemporary chart. It is listed at No. 27 on Billboard's All Time Top 100. Alongside "Stayin' Alive" and "Night Fever", it is one of the group's three tracks on the list. The song was covered by Take That for their 1996 Greatest Hits album, reaching No. 1 on the UK Singles Chart for three weeks.

Saturday Night Fever is the soundtrack album from the 1977 film Saturday Night Fever starring John Travolta. The soundtrack was released on November 15, 1977 by RSO Records. Prior to the release of Thriller by Michael Jackson, Saturday Night Fever was the best-selling album in music history, and still ranks among the best-selling soundtrack albums worldwide, with sales figures of over 40 million copies.