Hamilton Field is a former baseball field located in Fort Wayne, Indiana, United States. The ground was home to the Fort Wayne Kekiongas in the 1860s, prior to turning professional and joining the National Association for the 1871 season. The field was named after Allen Hamilton, who donated land for the field.
The field was located at the corner of Lewis Street and Clinton Street (present location of the Foellinger-Freimann Botanical Conservatory). A plaque at Headwaters Park states the Fort Wayne Kekiongas played their games, including the first professional baseball game ever, at League Park, on the east side of Headwaters Park. However, the Kekiongas never played at Headwaters Park, and the historic marker is incorrect.