X is an American punk rock band, formed in Los Angeles, California in 1977. Established among the first wave of American punk, the original members are vocalist Exene Cervenka, vocalist/bassist John Doe, guitarist Billy Zoom, and drummer DJ Bonebrake. They released seven studio albums from 1980 to 1993. After a period of inactivity during the mid to late 1990s, they reunited in the early 2000s, and currently tour.

X achieved limited mainstream success, but are considered one of the most revered punk rock bands and, by some critics, one of the best rock bands. One critic also suggests that X are one of the all-time greatest live rock performers. The band received an Official Certificate of Recognition from the City of Los Angeles in acknowledgment of their contributions to Los Angeles music and culture. They were also influential on various genres of music, including punk and folk rock.

In 2003, X's first two studio albums, Los Angeles and Wild Gift, were ranked by Rolling Stone magazine as being among the 500 greatest albums of all time.

X was founded by bassist/singer John Doe and guitarist Billy Zoom. Doe brought his poetry-writing girlfriend Exene Cervenka to band practices, and she eventually joined the band as a vocalist. Drummer DJ Bonebrake was the last of the original members to join after leaving local group The Eyes.

X's first record deal was with independent label Dangerhouse, for which the band produced two singles, "Adult Books" (1978) and "Los Angeles" ("We're Desperate" was the b-side to "Adult Books"). The Dangerhouse session version of "Los Angeles" was also featured in a Dangerhouse compilation in 1979 called "Yes L.A." (a play on the now-famous No Wave compilation No New York), a picture disc that featured other early-punk-era LA bands like the Weirdos and Black Randy.