Graham William Nash OBE (born 2 February 1942) is a British and American musician, singer and songwriter. He is known for his light tenor voice and for his contributions as a member of the Hollies and Crosby, Stills & Nash.

Nash is a photography collector, a published photographer, and digital image printing pioneer. He was inducted into the Rock and Roll Hall of Fame as a member of Crosby, Stills & Nash in 1997 and as a member of the Hollies in 2010. He was appointed an Officer of the Order of the British Empire (OBE) in the 2010 Birthday Honours List for services to music and to charity.

Nash holds four honorary doctorates, including one from the New York Institute of Technology, one in music from the University of Salford in 2011 and one in fine arts from Lesley University in Cambridge, Massachusetts.

Graham William Nash was born on 2 February 1942 in Blackpool, Lancashire, to where his mother had been evacuated from her hometown of Salford when World War II began. The family returned to Salford, where Nash grew up. When Nash was 14, his father was sent to prison for a year for receiving a stolen camera; he had bought the camera as a present for Graham but had then refused to disclose to the police the name of the relative who had sold it to him.

In the early 1960s, Nash co-founded the Hollies, one of the UK's most successful pop groups, with school friend Allan Clarke, and was credited as the group's leader on their first album. He was featured vocally on "Just One Look" (1964) and sang his first lead vocal on the original Hollies song "To You My Love" on the band's second album In The Hollies Style of the same year. He often sang featured bridge vocals on later Hollies recordings ("So Lonely", "I've Been Wrong", "Pay You Back With Interest") and provided lead vocals on several later singles, notably "On a Carousel" and "Carrie Anne" (both 1967).

Nash encouraged the Hollies to write their own songs, initially with Clarke, then with Clarke and guitarist Tony Hicks. From 1964 to mid-1966 they wrote under the alias L. Ransford. Their own names were credited on songs from "Stop Stop Stop" from October 1966 onward. In 1965, Nash, with Allan Clarke and guitarist Tony Hicks, formed Gralto Music Ltd, a publishing company which handled their own songs and later signed the young Reg Dwight (a.k.a. Elton John) who played piano and organ on Hollies 1969 and 1970 recordings.

Nash was pivotal in the forging of a sound and lyrics, often writing the verses on Clarke, Hicks & Nash songs. However, Nash also composed songs by himself under the 'team banner' (like Lennon & McCartney), including "Fifi the Flea" (1966), "Clown" (1966), "Stop Right There", and "Everything Is Sunshine" (1967). The Butterfly album included several of his songs that had less group participation and exhibited more of a singer-songwriter approach. He was disappointed when this new style did not register with their audience, especially "King Midas in Reverse" (Nash and producer Ron Richards clashed over this song because Richards believed it was 'too complex' to work as a hit single).

Nash initially met both David Crosby and Stephen Stills in 1966 during a Hollies US tour. On a subsequent visit to the US in 1968, he was more formally introduced to Crosby by mutual friend Cass Elliott in Laurel Canyon, Los Angeles. Nash left the Hollies to form a new group with Crosby and Stills. A trio at first, Crosby, Stills & Nash later became a quartet in 1969 with Neil Young: Crosby, Stills, Nash & Young (CSNY).