Westborough is a town located in Worcester County, Massachusetts, within the United States. It sits in the MetroWest region, a cluster of cities and towns lying west of Boston and east of Worcester. The area serves as a significant suburban hub, characterized by its position at the intersection of major highways including the Massachusetts Turnpike and Interstate 495. This geographic placement makes it a key node for regional commerce and commuting.

Incorporated on November 18, 1717, Westborough was the hundredth town established in Massachusetts, populated by twenty-seven families. It originally split from Marlborough as the west borough before Northborough separated from it in 1775. The town's history includes early indigenous use of the land and later industrial growth driven by mills along the Assabet River. Its official name was briefly changed to Westboro in 1894 but reverted in 1971.

The town features several districts and sites listed on the National Register of Historic Places, including the Vintonville Historic District and the West Main Street Historic District. Notable landmarks include the Lyman School for Boys and the former Westborough State Hospital. The landscape includes Lake Chauncy, which offers swimming and boating, and the headwaters of the Sudbury and Assabet rivers. Many historic mills have been converted into luxury condos or office spaces.

Westborough attracts visitors through its affluent suburban character and corporate headquarters, particularly for business travel. The area is home to the former Westboro Speedway, which operated from 1947 through 1985. Cultural appeal is enhanced by its historic architecture and proximity to Boston and Worcester. The town maintains a strong community identity, with residents commuting to major urban centers while enjoying a suburban lifestyle distinct from rural western Massachusetts.

The population was 21,567 at the 2020 census, residing in over 7,000 households. The economy is supported by a high median income and a significant immigrant community. Transportation access is facilitated by MBTA commuter rail stations on the Framingham/Worcester Line and extensive highway networks. The town offers public schools and maintains a diverse demographic profile with a strong Indian-American presence and high educational attainment rates among residents.