Jason Michael Johnson (born October 27, 1973) is an American former Major League Baseball pitcher.

Following the season, he was selected in the 1997 Expansion Draft by the newly created franchise, the Tampa Bay Devil Rays.

On June 8, 2005, Johnson became the first Tigers pitcher to hit a home run in a regular season game since Les Cain in 1971.

[14] He pitched one season in Japan, then on February 7, 2008, signed a minor league contract with an invitation to spring training with the Los Angeles Dodgers.

On January 6, 2009, he signed a minor league contract with an invitation to spring training with the New York Yankees, where he was expected to compete for the final spot in the starting rotation.

[22] Johnson has type 1 diabetes and was the first Major League Baseball player to get permission to wear an insulin pump on the field.

He wore the pump on his belt on the left side of his lower back, in order to minimize the chance of it being hit by a bat or thrown ball.