John Paul Cain is an American professional golfer who played on the Senior Professional Golf Association Tour.
Cain was born and raised in Sweetwater, Texas.
He attended Texas Technical University and was a member of the golf team from 1955–1956 and 1958–1959.
Cain worked as a stockbroker in Houston until turning professional in 1988 at the age of 52. In 1994, Cain, playing as a sponsor"s exemption, earned his second Senior Tour title at the Ameritech Senior Open by one stroke over Jim Colbert and Simon Hobday, both of whom had also finished at T-2 the previous year. 1959 Texas State Amateur Senior Professional Golf Association Tour wins (2).