Butler is married to Gloria Butler, who managed Heaven & Hell. He was divorced from his first wife in 1980. He also shares his Los Angeles home with several cats, of whom he has posted pictures on his website. His oldest son, Biff Butler, was the frontman in the nu metal band Apartment 26. Butler says Biff is very religious and brings up his children in the Catholic faith. Butler's other son James earned a degree in social sciences from Oxford University and resides in London. Butler describes him as "very politically minded". "My youngest is extremely left-wing, and I think it's because he was brought up knowing wealth and money, whereas I was brought up having no money whatsoever. That's where the church came in and made up for the lack of money because everybody knew each other in the street and everybody used to help each other out", Butler said.