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is a town in Hartford County, Connecticut, United States. It contains the census-designated place (CDP) of Terramuggus. The population was 5,709 at the 2000 census. Marlborough is a suburban/rural upper middle class suburb of Hartford.
According to the United States Census Bureau, the town has a total area of 23.4 square miles (60.7 km²), of which, 23.3 square miles (60.3 km²) of it is land and 0.2 square miles (0.4 km²) of it (0.64%) 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.