Gregory Walter Graffin (born November 6, 1964) is an American singer and evolutionary biologist. He is most recognized as the lead vocalist and only constant member of punk rock band Bad Religion, which he co-founded in 1980. He embarked on a solo career in 1997, when he released the album American Lesion. His follow-up album, Cold as the Clay, was released nine years later. His newest solo work is Millport, released in 2017.
Graffin obtained his PhD in zoology at Cornell University and has lectured courses in natural sciences at both the University of California, Los Angeles and at Cornell University.
In 1980, at the age of 15, Graffin and a few high school classmates formed Bad Religion in Southern California's San Fernando Valley. After making a name for themselves in the Los Angeles punk scene, releasing two EPs and two full-length albums, they disbanded around 1985. However, Bad Religion reformed in 1986 with a new line-up, consisting of Graffin on vocals, Brett Gurewitz and Greg Hetson on guitars, Jay Bentley on bass, and Pete Finestone on drums. In 1988, they released Suffer, which was a comeback for Bad Religion as well as a watershed for the Southern California punk sound popularized by guitarist Gurewitz's Epitaph Records. The reunion line-up made two more records before Finestone left the band in 1991.

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