Parliament-Funkadelic (abbreviated as P-Funk) is an American music collective of rotating musicians headed by George Clinton, primarily consisting of the funk bands Parliament and Funkadelic, both active since the 1960s. With an eclectic style drawing on psychedelia, outlandish fashion, and surreal humor, they have released albums such as Maggot Brain (1971), Mothership Connection (1975), and One Nation Under a Groove (1978) to critical praise, and scored charting hits with singles such as "Tear the Roof Off the Sucker" (1975) and "Flash Light" (1978). Overall, the collective achieved thirteen top ten hits in the American R&B music charts between 1967 and 1983, including six number one hits. Their work has had an influential effect on subsequent funk, post-punk, hip-hop, and techno artists of the 1980s and 1990s, while their collective mythology has helped pioneer Afrofuturism.

The collective's origins date back to the doo-wop group the Parliaments, formed by Clinton during the late 1950s in suburban New Jersey. By the late 1960s, Clinton had gained experience as a producer-writer for Motown Records and, inspired by artists such as Jimi Hendrix, Sly Stone, and Frank Zappa, he relocated to Detroit and enlisted musicians from his New Jersey days in his own two sister bands Parliament and Funkadelic; the first would go on to develop a commercially successful style of science fiction–inspired funk, while the second pursued a heavier sound which blended funk with psychedelic rock. The name "Parliament-Funkadelic" became the catch-all term for the dozens of related musicians recording and touring different projects in Clinton's orbit, including the female vocal spinoff groups the Brides of Funkenstein and Parlet. Financial and label issues slowed the collective's recorded output in the 1980s while Clinton and other members began solo careers, with Clinton also consolidating the collective's multiple projects and touring under names such as George Clinton and the P-Funk All-Stars. In the 1990s, their sound became the chief inspiration for the West Coast hip hop subgenre G-funk.

Prominent collective members have included bassist Bootsy Collins (who formed the spinoff group Bootsy's Rubber Band), keyboardist Bernie Worrell, guitarists Eddie "Maggot Brain" Hazel, Michael Hampton, and Garry "Diaper Man" Shider, and horn players Fred Wesley and Maceo Parker. Some former members of Parliament perform under the name "Original P". Sixteen members of Parliament-Funkadelic were inducted to the Rock and Roll Hall of Fame in 1997. In 2019, the group was given the Grammy Lifetime Achievement Award.

The P-Funk story began in 1956 in Newark, New Jersey, with a doo-wop group formed by fifteen-year-old George Clinton. This was The Parliaments, a name inspired by Parliament cigarettes. By the early 1960s, the group had solidified into the five-man lineup of Clinton, Ray "Stingray" Davis, Clarence "Fuzzy" Haskins, Calvin Simon and Grady Thomas. Later, the group rehearsed in a barbershop in Plainfield, New Jersey co-owned by Clinton and entertained the customers. After having performed for almost ten years, the Parliaments had added a rhythm section in 1964 -- for tours and background work -- consisting of guitarist Frankie Boyce, his brother Richard on bass, and drummer Langston Booth; The Parliaments finally achieved a hit single in 1967 with "(I Wanna) Testify" while Clinton began commuting to Detroit as a songwriter and producer for Motown Records.

The West End of Plainfield, New Jersey, was once home to the Silk Palace, a barbershop at 216 Plainfield Avenue owned in part by Clinton, staffed by various members of Parliament-Funkadelic and known as the "hangout for all the local singers and musicians" in Plainfield's 1950s and 1960s doo-wop, soul, rock and proto-funk music scene.

By the late 1960s, Clinton had assembled a touring band to back up the Parliaments, the first stable lineup of which included Billy Bass Nelson (bass), Eddie Hazel (lead guitarist), Tawl Ross (guitarist), Tiki Fulwood (drums), and Mickey Atkins (keyboards). After a contractual dispute in which Clinton temporarily lost the rights to the name "The Parliaments", Clinton brought the backing musicians forward. When the band relocated to Detroit, their guitar-based, raw funk sound, with its heavy psychedelic rock influences, inspired "Billy Bass" Nelson, who coined the name "Funkadelic". Clinton signed Funkadelic to Westbound Records, and the five Parliaments singers were credited as "guests" while the five musicians were listed as the main group members. The debut album Funkadelic was released in 1970.

Meanwhile, Clinton regained the rights to the name "The Parliaments" and initiated another new entity, now known as Parliament, with the same five singers and five musicians but this time as a smoother R&B-based funk ensemble that Clinton positioned as a counterpoint to the more rock-oriented Funkadelic. Parliament recorded Osmium for Invictus Records in 1970, and after a hiatus in which Clinton focused on Funkadelic, Parliament was signed to Casablanca Records and released its debut for that label Up for the Down Stroke in 1974. The two bands began to tour together under the collective name "Parliament-Funkadelic".

By this time, the original ten-member lineup of Parliament-Funkadelic had begun to splinter, but many others joined for various album releases by either band, leading to a collective with a fluid and rapidly expanding membership. Notable members to join during this period include keyboardist Bernie Worrell, bassist Bootsy Collins, guitarist Garry Shider, bassist Cordell Mosson, and The Horny Horns.