Queen are a British rock band formed in London in 1970 by Freddie Mercury (lead vocals, piano), Brian May (guitar, vocals), and Roger Taylor (drums, vocals), later joined by John Deacon (bass). Their earliest works were influenced by progressive rock, hard rock and heavy metal, but the band gradually ventured into more conventional and radio-friendly works by incorporating further styles, such as arena rock and pop rock.

Before forming Queen, May and Taylor had played together in the band Smile. Mercury was a fan of Smile and encouraged them to experiment with more elaborate stage and recording techniques. He joined in 1970 and suggested the name "Queen". Deacon was recruited in February 1971, before the band released their self-titled debut album in 1973. Queen first charted in the UK with their second album, Queen II, in 1974. Sheer Heart Attack later that year and A Night at the Opera in 1975 brought them international success. The latter featured "Bohemian Rhapsody", which topped the UK singles chart for nine weeks and helped popularise the music video format. The band's 1977 album News of the World contained "We Will Rock You" and "We Are the Champions", which have become anthems at sporting events. By the early 1980s, Queen were one of the biggest stadium rock bands in the world. "Another One Bites the Dust" from The Game (1980) became their best-selling single, and their 1981 compilation album Greatest Hits is the best-selling album in the UK and has been certified 9× Platinum in the US by the Recording Industry Association of America (RIAA). Their performance at the 1985 Live Aid concert is ranked among the greatest in rock history by various publications. In August 1986, Mercury gave his last performance with Queen at Knebworth, England.

Mercury was diagnosed with AIDS in 1987. The band released two more albums, The Miracle in 1989 and Innuendo in 1991. On 23 November 1991, Mercury publicly revealed his AIDS diagnosis, and the next day died of bronchopneumonia, a complication of AIDS. One more album was released featuring Mercury's vocals, 1995's Made in Heaven. Deacon retired in 1997, while May and Taylor continued to make sporadic appearances together. Since 2004, they have toured as "Queen +", with vocalists Paul Rodgers until 2009 and Adam Lambert since 2011.

Queen have been a global presence in popular culture for more than half a century. Estimates of their record sales range from 250 million to 300 million, making them one of the world's best-selling music artists. In 1990, Queen received the Brit Award for Outstanding Contribution to British Music. They were inducted into the Rock and Roll Hall of Fame in 2001, and with each member having composed hit singles, all four were inducted into the Songwriters Hall of Fame in 2003. In 2005, they received the Ivor Novello Award for Outstanding Song Collection from the British Academy of Songwriters, Composers, and Authors. In 2018, they were presented the Grammy Lifetime Achievement Award, and they were awarded the Polar Music Prize in 2025.

The founding members of Queen met in west London during the late 1960s. Guitarist Brian May had built his own guitar with his father in 1963, and formed the group 1984 (named after Orwell's novel) the following year with singer Tim Staffell. May left the group in early 1968 to focus on his degree in Physics and Infrared Astronomy at Imperial College and find a group that could write original material. He formed the group Smile with Staffell (now playing bass) and keyboardist Chris Smith. To complete the line-up, May placed an advertisement on a college notice board for a "Mitch Mitchell/Ginger Baker type" drummer; Roger Taylor, a young dental student, auditioned and got the job. Smith left the group in early 1969, immediately before a gig at the Royal Albert Hall with Free and the Bonzo Dog Doo-Dah Band.

While attending Ealing Art College in west London, Staffell became friends with fellow student Farrokh "Freddie" Bulsara, who was from Zanzibar and of Indian Parsi descent. Bulsara had studied fashion design for a year before switching to graphic art and design, and soon became a keen fan of Smile. He asked if he could join the group as lead singer, but May felt Staffell would not give up that role. He also ran a stall in Kensington Market with Taylor.

In 1970, Staffell quit Smile, feeling his interests in soul and R&B clashed with the group's hard rock sound and being fed up with the lack of success. He formed the group Humpy Bong with former Bee Gees drummer Colin Petersen. The remaining members accepted Bulsara as lead singer, and recruited Taylor's friend Mike Grose as bassist. The four played their first gig at a fundraising event in Truro on 27 June 1970. Bulsara suggested the group should be renamed to "Queen". The others were uncertain at first, but he said, "it's wonderful, dear, people will love it". At the same time, he decided to change his surname to Mercury, inspired by the line "Mother Mercury, look what they've done to me" in the song "My Fairy King". The group played their first London gig on 18 July. The early set consisted of material that later appeared on the first two albums, along with various rock and roll covers, such as Cliff Richard and the Shadows' "Please Don't Tease". They attracted the attention of producer John Anthony, who was interested in the group's sound but thought they had the wrong bass player. After three live gigs, Mike Grose decided not to continue with the band and was replaced by Barry Mitchell (ex Crushed Butler). Mitchell played thirteen gigs with Queen between August 1970 and January 1971. In turn, Mitchell left in January 1971 and was replaced by Doug Bogie for two live gigs.

In February 1971, John Deacon joined Queen. In addition to being an experienced bassist, his quiet demeanour complemented the band, and he was skilled in electronics. On 2 July, Queen played their first show with the classic line-up of Mercury, May, Taylor and Deacon at a Surrey college outside London. May called Terry Yeadon, an engineer at Pye Studios where Smile had recorded, to see if he knew anywhere where Queen could go. Yeadon had since moved to De Lane Lea Studios' new premises in Wembley, and they needed a group to test out the equipment and recording rooms. He tried asking the Kinks but couldn't get hold of them. Therefore, he told Queen they could record some demos in exchange for the studio's acoustic tests. They recorded five of their own songs, "Liar", "Keep Yourself Alive", "Great King Rat", "The Night Comes Down" and "Jesus". During the recording, producers John Anthony and Roy Thomas Baker visited the band. The two were taken with "Keep Yourself Alive" and began promoting the band to several record companies.