Marlborough is a town in Hartford County, Connecticut, United States. It contains the census-designated place (CDP) of Terramuggus. The town's population was 6,404 at the 2010 census. Marlborough is an upper class suburban and rural community. The local high school is RHAM High School. In 2013, Marlborough ranked third (of 24) in Connecticut Magazine's biannual ranking of Connecticut small towns, median home sale price between $175,000 and $224,999.

According to the United States Census Bureau, the town has a total area of 23.5 square miles (60.9 km²), of which 23.4 square miles (60.5 km²) is land and 0.15 square miles (0.4 km²), or 0.73%, is water. Marlborough is adjacent to four other Connecticut towns (Glastonbury to the north, East Hampton to the west, Colchester to the south, and Hebron to the east). East Hampton, Colchester and Hebron are each in different counties from each other and from Marlborough.

Route 2, a two-lane highway (sometimes three) in most sections, bisects the town, and there are three Marlborough exits, at South Main Street, Route 66, and West Road, although there are exits westbound only for South Main and eastbound only for West Road. It takes approximately 15– 20 minutes to get to Hartford, 40 minutes to New London, 45 minutes to New Haven, and 40 minutes to Springfield, MA. Marlborough is generally equidistant between Boston and New York. Boston is an hour and 45 minutes away, while New York City is a two-hour car ride, pending traffic conditions. Popular vacation areas are also reasonable drives from Marlborough. The Berkshire Mountains are an hour and 20 minutes away, and popular Rhode Island beaches, depending on which one you go to, are an hour (Misquamicut, Westerly) to an hour and 20 minutes away (Narragansett).

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