Nitro American heavy metal band from Hollywood, California. Formed in 1988, the group originally featured vocalist Jim Gillette, guitarist Michael Angelo Batio, bassist T. J. Racer and drummer Bobby Rock from the Vinnie Vincent Invasion / Nelson . Nitro released its debut album O.F.R. in 1989, which reached number 140 on the US Billboard 200. Rock was replaced by K. C. Comet for the album's tour and Racer would leave the band thereafter. Nitro II: H.W.D.W.S., released in 1992, featured Ralph Carter on bass and Johnny Thunder on drums. The group broke up in 1993, with a number of previously unreleased demo recordings issued on the 1999 album Gunnin' for Glory.

In late 2016, it was announced that Gillette and Batio had reformed the band, with Lamb of God drummer Chris Adler added to the group's lineup. Plans were made to record a third album – which would have been the band's first full-length studio album since 1992 – with Victor Wooten on bass and Kane Churko producing. Matt DeVries performed in place of Wooten at live shows. In 2017, "It Won't Die" was released as the lead single from the album. However, Batio announced in May 2019 that the band had once again split up, but added that some of the material from the abandoned third album would surface on his next solo release.

O.F.R. (Out-F**king-Rageous) is the debut studio album by American heavy metal band Nitro. Recorded at Front Page Productions in Costa Mesa, California, it was produced by the band's vocalist Jim Gillette and guitarist Michael Angelo Batio alongside engineer Charlie Watts and executive producer Bob Cahill. The album was released on May 30, 1989 by Rampage Records, a division of Rhino Entertainment, and peaked at number 140 on the US Billboard 200.

Following the release of his debut solo album Proud to Be Loud the previous year, Gillette formed Nitro in 1988 with Angelo, bassist T. J. Racer (both of whom had performed on the release) and drummer Bobby Rock. All songwriting on O.F.R. is credited solely to Gillette and Angelo, although Racer claims that he also contributed. The album was supported by the release of "Freight Train" and "Long Way from Home" as singles with accompanying music videos.