Ian Thomas Garner MacKaye (; born April 16, 1962) is an American singer, songwriter, guitarist, musician, record label owner and producer. Active since 1979, MacKaye is best known as the co-founder and owner of Dischord Records, a Washington, D.C.-based independent record label and the frontman of the influential hardcore punk band Minor Threat and the post-hardcore band Fugazi. MacKaye was also the frontman for the short-lived bands The Teen Idles, Embrace and Pailhead, a collaboration with the band Ministry. MacKaye is a member of The Evens, a two-piece indie rock group he formed with his wife Amy Farina in 2001.
Along with his seminal band Minor Threat, he is credited with coining the term "straight edge" to describe a personal ideology that promotes independence by countering the popular appeal of drug and alcohol abuse, though MacKaye has stated that he did not intend to turn it into a movement.
A key figure in the development of hardcore punk and an independent-minded, do-it-yourself punk ethic, MacKaye has produced releases by Q and Not U, John Frusciante, 7 Seconds, Nation of Ulysses, Bikini Kill, Rites of Spring, Dag Nasty and Rollins Band.