The Belvidere Historic District is a 132-acre (53 ha) historic district encompassing the town of Belvidere, the county seat of Warren County, New Jersey, United States.

It was added to the National Register of Historic Places on October 3, 1980 for its significance in architecture, commerce, community planning, industry, politics and government during the 19th century.

[1] The district is bounded by Market and Race streets; Greenwich and Mansfield avenues; and the Pequest River.

The two and one-half story brick Warren County Courthouse was built in 1825, remodeled around 1870, and extended in 1960.

The two and one-half story stone building features Federal architecture.