Jack Russell Spring (March 11, 1933 – August 2, 2015) was an American Major League Baseball relief pitcher.

He, along with Art Fowler, Tom Morgan, and later Julio Navarro, were the Angels' most reliable pitchers out of the bullpen during their second and third seasons.

He was traded by the Angels on May 15, 1964, and pitched for three more clubs before making his last major league appearance on August 31, 1965.

In 186 total innings pitched, Spring allowed 195 hits and 78 bases on balls; he fanned 86.

He was inducted into the Inland Northwest Sports Hall of Fame in 2005 alongside former Utah Jazz basketball player John Stockton at a ceremony in Spokane, WA.