Bolton is a town in Worcester County, Massachusetts, United States. Bolton is in eastern Massachusetts, located 25 miles west-northwest of downtown Boston. The population was 4,897 at the 2010 census.

The town of Bolton was incorporated on June 24, 1738, following an influx of settlers. Town historian Esther Whitcomb, descendant of one of Bolton's earliest documented settlers, cites the recorded birth of a son, Hezekiah, to Josiah Whitcomb in 1681. By 1711, according to Whitcomb, more than 150 people were living on Bolton soil, despite a local history of Indian uprisings and one massacre. Many early houses were protected by flankers, and were designated as garrisons. Bolton's history is interesting because it is reflective of early settlement patterns in the central Massachusetts area, and the conflicts with King Philip (Metacom) and his Indian soldiers. The town was formerly part of the town of Lancaster, but seceded along the Still River, where the current boundary line still stands.

In the 1920s Bolton was used as a setting and mentioned a number of times in H.P. Lovecraft's fiction: as a setting in his “Herbert West — Reanimator”, and also mentioned in his “The Rats in the Walls” and “The Colour out of Space”.

According to the United States Census Bureau, the town has a total area of 20.0 square miles (52 km²), of which 19.9 square miles (52 km²) is land and 0.1 square miles (0.26 km²), or 0.35%, is water.

Bolton is located in MetroWest, surrounded by several towns:

As of the census of 2000, there were 4,148 people, 1,424 households, and 1,201 families residing in the town. The population density was 208.1 inhabitants per square mile (80.3/km²). There were 1,476 housing units at an average density of 74.1 per square mile (28.6/km²). The racial makeup of the town was 97.76% White, 0.19% African American, 0.05% Native American, 1.30% Asian, 0.02% Pacific Islander, 0.19% from other races, and 0.48% from two or more races. Hispanic or Latino of any race were 0.80% of the population.

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