Harry Koch "Dutchman" Fritz (September 30, 1890 – November 4, 1974) was a third baseman for Major League Baseball teams the Philadelphia Athletics and Chicago Whales.

He played for Wilmington from 1911 to 1913 and also with the Athletics late in the season for five games for the 1913 World Series winning team.

While Rollie Zeider was the everyday third baseman, Fritz was the most utilized backup infielder on the second place team.

Fritz was married in Philadelphia on January 27, 1915, at St. Paul's Reformed Episcopal Church to Edna L. McMunn.

[2] St. Louis later decided they didn't need his services and he was returned to the Chicago Federal League club, hoping he could be available by opening day.