Conspiracy of One is the sixth studio album by American rock band the Offspring, released on November 14, 2000, by Columbia Records. By the time of its release, the band had come out in support of peer-to-peer file sharing, claiming it would not hurt sales. Conspiracy of One was originally planned to be released directly on their website before retail, until Columbia Records threatened to sue and the album ended up as a physical release. The album was the last to feature drummer Ron Welty, who was fired from the band in 2003 and went on to form his own band Steady Ground.

The Offspring is an American punk rock band from Garden Grove, California, formed in 1984. Originally formed under the name Manic Subsidal, the band's current lineup consists of lead vocalist and rhythm guitarist Bryan "Dexter" Holland, lead guitarist Kevin "Noodles" Wasserman, bassist Todd Morse, multi-instrumentalist Jonah Nimoy and drummer Brandon Pertzborn. The Offspring is often credited for reviving mainstream interest in punk rock in the 1990s. During their 39-year career, the Offspring has released 10 studio albums and sold more than 40 million records, making them one of the best-selling punk rock bands in history.