West Peterborough is an unincorporated community in the town of Peterborough in Hillsborough County, New Hampshire, United States. It is located along Nubanusit Brook in the western part of the town. Union Street leads 2 miles (3 km) east to the Peterborough town center and 0.6 miles (1.0 km) south to New Hampshire Route 101, a highway connecting Keene to the west with Milford to the east.