The Princeton Center Historic District is a historic district encompassing the 19th century center of Princeton, Massachusetts. The district is centered at the junction of Hubbardston and Mountain Roads, and includes the town common, town hall, public library, and First Congregational Church. When first listed on the National Register of Historic Places in 1999, the district encompassed 11 acre, and included only the common, town hall, and library; it was expanded in 2006 to 165 acre, and included much of the village of Princeton Center.