Belmont is a town in Middlesex County, Massachusetts, a suburb of Boston. It is part of the Boston metropolitan area. Its population was 24,729 at the 2010 census.

Belmont was established on March 10, 1859, by former citizens of, and land from the bordering towns of Watertown, to the south; Waltham, to the west; and Arlington, then known as West Cambridge, to the north. They also wanted a town where no one could buy or sell alcohol. Even today, a person cannot buy alcohol in this town. The town was named after Bellmont, the 200 acre (0.8 km²) estate of one of the leading and largest donor to its createion, John Perkins Cushing. Cushing Square is named after him and what was left of his estate after it nearly burned to the ground became a Belmont Public Library branch. The easternmost section of the town, including the western portion of Fresh Pond, was annexed by Camobridge in 1880 in a dispute over a slaughterhouse licensed in 1878 on Fresh Pond, so that Cambridge could protect Fresh Pond, a part of its municipal water system.

Preceding its incorporation, Belmont was an agrarian based town, with several large farms servicing Boston for produce and livestock. It remained largely the same until the turn of the twentieth century, when trolley service and better roads were introduced, making the town more attractive as a residential area, most notably for the building of large estates.

Belmont's population grew by over 90 percent during the 1920s.

The economics of the town shifted from purely agrarian to a commercial greenhouse base: much of the flower and vegetable needs of Boston were met from the Belmont 'hothouses' which persisted until about 1983 when Edgar's, the last large greenhouse firm in the area, closed. Other commercial enterprises in Belmont included mining and waste management. The reclamation of a large dump and quarry off Concord Avenue into sites for the Belmont High School and the Clay Pit Pond stands as a lasting example of environmental planning. With the introduction of automobiles and highways Belmont continued its transition to a commuter-based suburb throughout the twentieth century.

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