Newhallville is a neighborhood in the city of New Haven, Connecticut, named for industrialist George Newhall.
As delineated on city planning maps, Newhallville is bordered on the north by the town of Hamden, on the east by Winchester Avenue, on the south by Munson Street, on the southwest by Crescent Street, and on the northwest by Fournier Street. The main through routes are Dixwell Avenue, Shelton Avenue, Winchester Avenue, and Bassett Street. Once home to several industries, the neighborhood is now almost entirely residential. The route of the Farmington Canal runs through the middle of the neighborhood. The former Winchester Repeating Arms factory complex in Newhallville occupies 75 acres (30 ha) in the neighborhood. It is now the site of Science Park at Yale, an initiative started in 1981 by Yale University, the City of New Haven, and the Olin Corporation to utilize and redevelop the sites and buildings where the former Winchester Repeating Arms factory was once located. The southern part of the neighborhood (south of Hazel and Highland streets) and the northern part of the adjacent Dixwell neighborhood are listed on the National Register of Historic Places as the Winchester Repeating Arms Company Historic District, bounded on the south by Charles, Admiral, and Sachem streets.
The Newhallville area was a rural farming area until the middle of the 19th century. The Farmington Canal was built through the area in the late 1820s, but it did not bring the development that its promoters had hoped for. In the early 1850s the canal was converted to a railroad line, and George Newhall established a small factory near the railroad where he manufactured carriages. Other small factories followed, along with workers' houses and a boarding house that Newhall built in 1860 for his unmarried male employees.