Number One is the debut album by American heavy metal band Pist.On (or Piston).

It was first released in 1996 by Fierce Recordings/Futurist Label Group, before being repackaged and re-released by Atlantic Records on June 24, 1997.

[2] Another notable change, between the original album and the Atlantic version, is the spelling of the band's name, from Pist*On to simply Piston.

All songs written by Henry Font, except "Shoplifters of the World Unite" (Morrissey/Marr, c. 1987) The band signed with Atlantic Records in 1996 and the new label re-released Number One in 1997.

The Atlantic version of contained new artwork and a reworked lineup: However, the recording itself remained the same, so the liner notes included the following message: "Note: We are forced to mention (for legal purposes), that all lead guitars and backing vocals (on 'I Am No One'), on this recording, were played by Paul Poulos and drums & percussion played by Danny 'Jam' Kavadlo."