Sir Barry Alan Crompton Gibb CBE AC (born 1 September 1946) is a British musician, singer-songwriter, and record producer who rose to worldwide fame as a member of the Bee Gees, one of the most commercially successful groups in the history of popular music. With his younger brothers, fraternal twins Robin and Maurice Gibb, he formed a songwriting partnership beginning in 1955. He has lived in Britain, Australia, and the United States, holding dual UK?US citizenship, the latter since 2009.

Born in Douglas on the Isle of Man, Gibb was raised in Manchester, where he took part in the skiffle craze. In 1955, he formed his first band, the Rattlesnakes, which evolved into the Bee Gees in 1960, after the Gibb family had moved to Redcliffe, Queensland, Australia. They later returned to England, where they achieved worldwide fame, then moved to the United States in 1975. Well-known for his wide vocal range, Gibb's most notable vocal trait is a far-reaching high-pitched falsetto. As a songwriter, he shares with John Lennon and Paul McCartney the record for most consecutive Billboard Hot 100 number ones, each having six. In total, he has written or co-written sixteen Billboard Hot 100 number ones. Guinness World Records lists Gibb as the second most successful songwriter in history, behind McCartney.

Gibb's career has spanned over 60 years. In 1994, he was inducted into the Songwriters Hall of Fame with his brothers. In 1997, as a member of the Bee Gees, he was inducted into the Rock and Roll Hall of Fame, and received the Brit Award for Outstanding Contribution to Music. He is a fellow of the British Academy of Songwriters, Composers and Authors. In 2007, Q magazine ranked him number 38 on its list of the "100 Greatest Singers". Gibb was appointed a Commander of the Order of the British Empire (CBE) in the 2002 New Year Honours for services to music and entertainment, and a Knight Bachelor in the 2018 New Year Honours for services to music and charity. He was also made an Honorary Companion of the Order of Australia on 27 January 2022, in the 2022 Special Honours, for eminent service to the performing arts as a musician, songwriter, and record producer, to the advancement of Australian music artists, and to philanthropy Inducted into the National Recording Registry by the Library of Congress as being "culturally, historically, or artistically significant".