The Wallace House is a Georgian style historic house, which served as the headquarters of General George Washington during the second Middlebrook encampment (1778–79), located at 38 Washington Place, Somerville, Somerset County, New Jersey, United States. It was added to the National Register of Historic Places on December 2, 1970.

"Middlebrook encampment" may refer to one of two different seasonal stays of the Continental Army in central New Jersey near the Middlebrook in Bridgewater Township in Somerset County. They are usually differentiated by either the date of the encampment or their chronological order.