Ian Thomas Garner MacKaye is an American musician. Active since 1979, he is best known as the co-founder and owner of Dischord Records, a Washington, D.C.-based independent record label, and the frontman of hardcore punk band Minor Threat and post-hardcore band Fugazi. MacKaye was also the bassist for the short-lived band the Teen Idles, and frontman for 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 and in 2018 formed the band Coriky with Farina and his Fugazi band mate Joe Lally.

Straight edge is a subculture of hardcore punk whose adherents refrain from using alcohol, tobacco and recreational drugs in reaction to the punk subculture's excesses. Some adherents refrain from engaging in casual sex, follow a vegetarian or vegan diet and do not consume caffeine or prescription drugs. The term "straight edge" was adopted from the 1981 song "Straight Edge" by the hardcore punk band Minor Threat.