NOFX /ˌnoʊɛfˈɛks/ is an American punk rock band from Los Angeles, California. They were formed in 1983 by vocalist/bassist Fat Mike and guitarist Eric Melvin. Drummer Erik Sandin joined NOFX shortly after. In 1991, El Hefe joined to play lead guitar and trumpet, rounding out the current line-up. The band rose to popularity with their fifth studio album Punk in Drublic (1994).

NOFX's mainstream success was signified by a growing interest in punk rock during the 1990s, but unlike many of their contemporaries (including Bad Religion, Green Day and The Offspring), they have never been signed to a major label. NOFX has released twelve studio albums, fifteen extended plays and a number of seven-inch singles. Their latest studio album, First Ditch Effort, was released on October 7, 2016. The group has sold over 8 million records worldwide, making them one of the most successful independent bands of all time. NOFX broadcast their own show on Fuse TV entitled NOFX: Backstage Passport.