"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 (becoming the first of six consecutive US number-one hits). 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.

"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. It was originally intended for Yvonne Elliman, but she later recorded "If I Can't Have You" instead.

During the Bee Gees' 2001 Billboard magazine interview, Barry reportedly said that "How Deep Is Your Love" was his favorite Bee Gees song.

The Bee Gees started to record it in from February to March 1977 in Le Château, Hérouville in France, continued it in Criteria Studios in Miami in April, and later in September, the song was finished in Cherokee Studios, Los Angeles.

The soundtrack includes two versions — one by the Bee Gees and the other by Tavares. Both versions are featured in the film as well. The song has been recorded and performed by various artists but in different forms. The Bee Gees did not release this song as a single (though in Italy it peaked at No. 4 in September 1978 and even peaked at #39 in Billboard Easy Listening Charts), yet it has remained a staple on radio and one of their best known songs.

Saturday Night Fever is a 1977 American dance film directed by John Badham and starring John Travolta as Tony Manero, an emotionally immature young man whose weekends are spent visiting a local Brooklyn discotheque; Karen Lynn Gorney as Stephanie Mangano, his dance partner and eventual friend; and Donna Pescow as Annette, Tony's former dance partner and would-be girlfriend. While in the disco, Tony is the king. His care-free youth and weekend dancing help him to temporarily forget the reality of his life: a dead-end job, clashes with his unsupportive and squabbling parents, racial tensions in the local community, and his associations with a gang of macho friends.

The Bee Gees were a pop music group that was formed in 1958. The group's line-up consisted of brothers Barry, Robin and Maurice Gibb. The trio were successful for most of their decades of recording music, but they had two distinct periods of exceptional success: as a rock act in the late 1960s and early 1970s, and as prominent performers of the disco music era in the late 1970s. The group sang recognisable three-part tight harmonies; Robin's clear vibrato lead vocals were a hallmark of their earlier hits, while Barry's R&B falsetto became their signature sound during the late 1970s and 1980s. They wrote all of their own hits, as well as writing and producing several major hits for other artists.

Musician includes Maurice Gibb (bass guitar); Dennis Bryson (drums); Alan Kendall, Barry Gibb (guitar); Blue Weaver (keyboards); Albhy Galuten, Bee Gees, Karl Richardson (producers); Barry Gibb, Maurice Gibb, Robin Gibb (vocals).

I know your eyes in the morning sun
I feel you touch me in the pouring rain
And the moment that you wander far from me
I want to feel you in my arms again
And you come to me on a summer breeze
Keep me warm in your love, then you softly leave
And it's me you need to show
How deep is your love, how deep is your love
How deep is your love?
I really mean to learn
'Cause we're living in a world of fools
Breaking us down when they all should let us be
We belong to you and me
I believe in you
You know the door to my very soul
You're the light in my deepest, darkest hour
You're my savior when I fall
And you may not think I care for you
When you know down inside that I really do
And it's me you need to show
How deep is your love, how deep is your love
How deep is your love?
I really mean to learn
'Cause we're living in a world of fools
Breaking us down when they all should let us be
We belong to you and me
And you come to me on a summer breeze
Keep me warm in your love, then you softly leave
And it's me you need to show
How deep is your love, how deep is your love
How deep is your love?
I really mean to learn
'Cause we're living in a world of fools
Breaking us down when they all should let us be
We belong to you and me
How deep is your love, how deep is your love
I really mean to learn
'Cause we're living in a world of fools
Breaking us down when they all should let us be
We belong to you and me
How deep is your love, how deep is your love
I really mean to learn
'Cause we're living in a world of fools
Breaking us down when they all should let us be
We belong to you and me