The Lander–Stewart Mansion and Stites Building are two historic houses in the town of Phillipsburg in Warren County, New Jersey, United States.

They were added to the National Register of Historic Places on June 25, 2008, for their significance in architecture.

[1][3] They were listed as contributing properties of the Phillipsburg Commercial Historic District on October 8, 2008.

The Federal style building was later owned by John Lander (1798–1889), founder of the Warren Foundry & Machine Company, one of the town's largest employers.

The three-story brick townhouse at 102 South Main Street, the Lander–Stewart Mansion, was built around 1880 by Jacob S. Stewart, son-in-law of Lander.