Military Park is a 6-acre city park in Downtown Newark, Essex County, New Jersey, United States. It is a nearly triangular park located between Park Place, Rector Street and Broad Street. From 1667, when the city was planned, until 1869 it was a training ground for soldiers. In 1869 it became the town commons. The New Jersey Historical Society, Military Park Building and the New Jersey Performing Arts Center, and the Robert Treat Center are located across Park Place from the park.