| Jack Dittmer | |
| Position: | Second baseman |
| Bats: | Left |
| Throws: | Right |
| Birth Date: | 10 January 1928 |
| Birth Place: | Elkader, Iowa, U.S. |
| Death Place: | Strawberry Point, Iowa, U.S. |
| Debutleague: | MLB |
| Debutdate: | June 17 |
| Debutyear: | 1952 |
| Debutteam: | Boston Braves |
| Finalleague: | MLB |
| Finaldate: | June 23 |
| Finalyear: | 1957 |
| Finalteam: | Detroit Tigers |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .232 |
| Stat2label: | Home runs |
| Stat2value: | 24 |
| Stat3label: | Runs batted in |
| Stat3value: | 136 |
| Teams: |
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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 until, 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. He continued to play all three sports at the University of Iowa, where he was mainly known as a wide receiver. Dittmer was inducted into the University of Iowa Athletics Hall of Fame in 1993.