Cal Jammer (March 2, 1960 - January 25, 1995) was an adult film star of the early 1990s.

Born Randy Layne Potes in Bethesda, Maryland, he is best known for his relationship and marriage to porn actress Jill Kelly in 1993.

Potes suffered from severe depression and insecurities, which led to his addictive battle with illegal drugs. Kelly became involved in a lesbian relationship with porn actress P.J. Sparxx during this time, but continued to support Potes. She had attempted numerous times to get him professional help. He committed suicide by gunshot to the head on Kelly's doorstep.