Pinhead Gunpowder is an East Bay Punk Rock band consisting of Aaron Cometbus (drums, lyrics), Bill Schneider (bass), Billie Joe Armstrong (guitar, vocals) and Jason White (guitar, vocals).

Mike Kirsch (guitar, vocals) of Fuel (think Monuments to Excess) was part of the original band formed in 1991 but left the band citing personal differences with Green Day (the band for which Billie Joe Armstrong is most famous).

The band's name comes from a brand of "high octane" green tea discovered serendipitously by Aaron Cometbus during one of his many dumpster diving adventures. Aaron Cometbus, who releases the "Cometbus" fanzine, has played in many East Bay area bands such as Crimpshrine.

Pinhead Gunpowder has been on Lookout Records and Adeline Records (the latter co-owned by Billie Joe Armstrong and a major occupation of Jason White). Bill Schneider, also played bass with the band. Schneider is most recently Green Day's guitar tech/tour crew manager.