Chester is a town in Hampden County, Massachusetts, United States, situated in the western part of the state. It is part of the Springfield, Massachusetts metropolitan statistical area. The town includes the Chester Factory Village Historic District. The total population was 1,337 in the 2010 censusu.
The area opened for settlement in the 1750s as Township No. 9, chartered as Murrayfield on October 31, 1765. The town was incorporated as Chester on February 21, 1783. The Western Railroad (later Boston & Albany Railroad) opened to Chester on May 24, 1841.
According to the United States Census Bureau, the town has a total area of 37.1 square miles (96.2 km²), of which, 36.7 square miles (95.1 km²) of it is land and 0.4 square miles (1.0 km²) of it (1.08%) is water. It is drained by the west branch of the Westfield River.