John Franklin Prentice Jr. was an American cartoonist most known for taking over the comic strip Rip Kirby upon the death of the strip's creator, Alex Raymond.

Rip Kirby is an American comic strip created by Alex Raymond and Ward Greene featuring the adventures of private detective Rip Kirby. The strip ran from 1946 to 1999 and was in the hands of artist John Prentice for more than 40 years.