"How Deep Is Your Love" is a pop song written and recorded by the Bee Gees in 1977 and released as a single in September. 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 24 December 1977 (becoming the first of six consecutive US number-one hits) and stayed in the Top 10 for a then-record 17 weeks. The single spent six weeks atop the US adult contemporary chart. It is listed at number 22 on the 55th anniversary edition of 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 number-one on the UK Singles Chart for three weeks.
"How Deep Is Your Love" ranked number 375 on Rolling Stone's list of the 500 Greatest Songs of All Time. In a British TV special shown in December 2011, it was voted "The Nation's Favourite Bee Gees Song" by ITV viewers. The song set a record by accumulating 33 weeks in one chart run. Originally intended for Yvonne Elliman, but she later recorded "If I Can't Have You" instead.
On the Bee Gees' 2001 Billboard magazine interview, Barry reportedly said that "How Deep Is Your Love" was his favorite Bee Gees song.