The Bee Gees were a musical group formed in 1958 by brothers Barry, Robin, and Maurice Gibb. The trio was especially successful in popular music in the late 1960s and early 1970s, and later as prominent performers in the disco music era in the mid-to-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 mid-to-late 1970s and 1980s. The group wrote all their own original material, as well as writing and producing several major hits for other artists, and are regarded as one of the most important and influential acts in pop-music history. They have been referred to in the media as The Disco Kings, Britain's First Family of Harmony, and The Kings of Dance Music.

Born on the Isle of Man to English parents, the Gibb brothers lived in Chorlton, Manchester, England, until the late 1950s. There, in 1955, they formed the skiffle/rock and roll group the Rattlesnakes. The family then moved to Redcliffe, in the Moreton Bay Region, Queensland, Australia, and later to Cribb Island. After achieving their first chart successes in Australia as the Bee Gees, they returned to the UK in January 1967, when producer Robert Stigwood began promoting them to a worldwide audience. The Bee Gees' Saturday Night Fever soundtrack (1977) was the turning point of their career, with both the film and soundtrack having a cultural impact throughout the world, enhancing the disco scene's mainstream appeal. They won five Grammy Awards for Saturday Night Fever, including Album of the Year.

The Bee Gees have sold an estimated 120 million to 250 million records worldwide, placing them among the best-selling music artists of all time, as well as the most successful trio in the history of contemporary music. They were inducted into the Rock and Roll Hall of Fame in 1997; the Hall's citation stating at the time, "Only Elvis Presley, the Beatles, Michael Jackson, Garth Brooks and Paul McCartney have outsold the Bee Gees." With nine number-one hits on the Billboard Hot 100, the Bee Gees are the third-most successful band in Billboard charts history behind only the Beatles and the Supremes. Following Maurice's sudden death in 2003 aged 53, Barry and Robin retired from the group after 45 years of activity. However, in 2009 Robin announced that he and Barry had agreed the Bee Gees would re-form and perform again. Robin died in 2012, aged 62, and Colin Petersen died in 2024, aged 78, leaving Barry, Vince Melouney, and Geoff Bridgford as the surviving members of the group.

Born on the Isle of Man in the late 1940s, the Gibb brothers moved to their father Hugh Gibb's home town Chorlton-cum-Hardy, Manchester, England, in 1955. They formed a skiffle/rock-and-roll group, the Rattlesnakes, which consisted of Barry on guitar and vocals, Robin and Maurice on vocals, and friends Paul Frost on drums and Kenny Horrocks on tea-chest bass. In December 1957, the boys began to sing in harmony. The story is told that they were going to lip-sync to a record in the local Gaumont cinema (as other children had done on previous weeks), but, as they were running to the theatre, the fragile shellac 78-RPM record broke. The brothers had to sing live but received such a positive response from the audience that they decided to pursue a singing career. In May 1958, the Rattlesnakes disbanded when Frost and Horrocks left, so the Gibb brothers then formed Wee Johnny Hayes and the Blue Cats, with Barry as "Johnny Hayes".

In August 1958, the Gibb family, including older sister Lesley and infant brother Andy (born in March 1958), emigrated to Australia and settled in Redcliffe, Queensland, just north-east of Brisbane. The young brothers began performing to raise pocket money. Speedway promoter and driver Bill Goode, who had hired the brothers to entertain the crowd at the Redcliffe Speedway in 1960, introduced them to Brisbane radio-presenter jockey Bill Gates. The crowd at the speedway would throw money onto the track for the boys, who generally performed during the interval of meetings (usually on the back of a truck that drove around the track) and, in a deal with Goode, any money they collected from the crowd they were allowed to keep. Gates named the group the "BGs" (later changed to "Bee Gees") after his, Goode's and Barry Gibb's initials. The name was not specifically a reference to "Brothers Gibb", despite popular belief.

During the next few years, they began working regularly at resorts on the Queensland coast. Through his songwriting, Barry sparked the interest of Australian star Col Joye, who helped the brothers get a recording deal in 1963 with Festival Records subsidiary Leedon Records under the name "Bee Gees". The three released two or three singles a year, while Barry supplied additional songs to other Australian artists. In 1962 the Bee Gees were chosen as the supporting act for Chubby Checker's concert at the Sydney Stadium.

From 1963 to 1966, the Gibb family lived at 171 Bunnerong Road, Maroubra, in Sydney. Just before his death, Robin Gibb recorded the song "Sydney" about the brothers' experience of living in that city. It was released on his posthumous album 50 St. Catherine's Drive. The house was demolished in 2016.

A minor hit in 1965, "Wine and Women", led to the group's first LP, The Bee Gees Sing and Play 14 Barry Gibb Songs. By 1966 Festival Records was, however, on the verge of dropping them from the Leedon roster because of their perceived lack of commercial success. At this time the brothers met the American-born songwriter, producer, and entrepreneur Nat Kipner, who had just been appointed A&R manager of a new independent label, Spin Records. Kipner briefly took over as the group's manager and successfully negotiated their transfer to Spin in exchange for granting Festival the Australian distribution rights to the group's recordings. Through Kipner the Bee Gees met engineer-producer, Ossie Byrne, who produced (or co-produced with Kipner) many of the earlier Spin recordings, most of which were cut at his own small, self-built St Clair Studio in the Sydney suburb of Hurstville. Byrne gave the Gibb brothers virtually unlimited access to St Clair Studio over a period of several months in mid-1966. The group later acknowledged that this enabled them to significantly improve their skills as recording artists. During this productive time, they recorded a large batch of original material—including the song that became their first major hit, "Spicks and Specks" (on which Byrne played the trumpet coda)—as well as cover versions of current hits by overseas acts such as the Beatles. They regularly collaborated with other local musicians, including members of beat band Steve & The Board, led by Steve Kipner, Nat's teenage son.