John Douglas "Jack" Dittmer (January 10, 1928 – May 31, 2014) was a Major League Baseball second baseman.

He played six seasons in the majors, from 1952 until 1957, for the Boston / Milwaukee Braves and Detroit Tigers.

As an amateur, Dittmer was a three-sport star at Elkader High School, where he played basketball, baseball, and football.

In Dittmer's senior year of high school, he was selected the best high-school baseball player in the state of Iowa, and he went on to play in a National All-star Game.

This biographical article relating to an American baseball second baseman is a stub.