Peter Mazich (born October 25, 1964) is an American punk rock organist best known for his work with Mike Watt And The Secondmen.

For the first tour, Mazich used, almost unsuccessfully, a digital keyboard with a module that simulated an organ and rotating speaker.

Mazich joined Watt in recording The Secondman's Middle Stand in January and February 2004;[3] the album was released in October of that year.

Mazich continues to play with Watt & The Secondmen's original lineup for special Los Angeles-area gigs.

Mazich has been married twice; he lives in San Pedro with his second wife, Ljiljana Nikolovska, a former pop star in her native Croatia and former Yugoslavia.