Fanny was an American rock band, active in the early to mid 1970s. They were one of the first all-female rock groups to achieve critical and commercial success, including two Billboard Hot 100 Top 40 singles.

The group was founded by sisters June and Jean Millington (on guitar and bass respectively), who had been playing music together since they moved from the Philippines to California in the early 1960s. After playing through several variations of the band, they attracted the interest of producer Richard Perry who signed them to Reprise Records in 1969 as Fanny. The band recorded four albums together before June quit the group, leading to the original line-up splitting. Following a final album, Fanny disbanded in 1975. The Millington sisters have continued to play music together since the split, and with a former drummer, Brie Howard-Darling, formed the spin-off group Fanny Walked the Earth in 2018.

The group had attracted critical acclaim for rejecting typical girl group styles and expectations of women in the rock industry, and emphasizing their musical skills. Later groups such as the Go-Go's, the Bangles, and the Runaways cited Fanny as a key influence.

Sisters June and Jean Millington moved with their family from the Philippines to Sacramento, California, in 1961. They began to play music together on ukuleles, which helped them gain friends. In high school they formed an all-female band called the Svelts with June on guitar, Jean on bass, Addie Lee on guitar, and Brie Brandt on drums. Brandt left to get married and was later replaced by Alice de Buhr.

Lee and de Buhr later formed another all-female band, Wild Honey. The Millington sisters later joined this band as well. Wild Honey played Motown covers and eventually moved to Los Angeles. Frustrated by a lack of success or respect in the male-dominated rock scene, Wild Honey decided to disband after one final open-mic appearance at the Troubadour Club in Los Angeles in 1969. They were spotted at this gig by the secretary of producer Richard Perry, who had been searching for an all-female rock band to mentor.

Perry convinced Warner Bros. Records to sign the band, still known as Wild Honey, to Reprise Records. The group won the contract without the label hearing them play, on the grounds of being a novelty act, despite their genuine musical talent. Warner Bros. installed the band in a rented mansion formerly owned by Hedy Lamarr, on Marmont Lane near Sunset Boulevard. Prior to recording their first album, the band recruited keyboardist Nickey Barclay while bringing in early Svelts member Brie Brandt.

The band was then renamed Fanny, not with a sexual connotation but to denote a female spirit. The initial lineup consisted of June on guitar, Jean on bass, de Buhr on drums, Barclay on keyboards, and Brandt on lead vocals and percussion. Perry dismissed Brandt because he wanted the group to be a self-contained four-piece band like the Beatles. The Millingtons and Barclay all assumed lead vocal duties on alternating songs, while de Buhr sang lead occasionally on later albums.

Perry produced the band's first three albums, beginning with Fanny in 1970. Because of the connection to Perry and Reprise Records, Barclay was invited to tour with Joe Cocker as a backing singer, and consequently appeared on the album Mad Dogs and Englishmen. The group's cover of Cream's "Badge" from the first album earned significant radio airplay. The follow-up album, Charity Ball, was released the following year and its title track reached number 40 on the Billboard Hot 100. The members of Fanny also worked as session musicians, and played on Barbra Streisand's 1971 albums Stoney End and Barbra Joan Streisand, because Streisand had wanted to record with a small band.