Old Union County Courthouse is a historic courthouse located at Vine and Market Streets in New Berlin, Union County, Pennsylvania. It was built in 1815, and renovated in 1855-1857, to convert it to a schoolhouse. It is a 2 1/2-story, brick building, three bays wide and four bays deep with a gable roof. The roof features a center cupola. It was used as a school until 1952.