Joseph Jason "J. J." Putz (pronounced /ˈpʊts/; born February 22, 1977) is a Major League Baseball pitcher who is a free agent.

Born in Trenton, Michigan, Putz led Trenton High School to the 1994 Division 2 state championship. He graduated in 1995 and won the Mr. Baseball award for the state of Michigan.

Putz attended the University of Michigan, and was drafted by the Mariners in the 6th round in 1999. He made his Major League debut with the Mariners on August 11, 2003. In 2006, he became the closer for the Mariners.