Middletown is a city located in Middlesex County, Connecticut, United States, Located along the Connecticut River, in the central portion of the state, it is 16 miles (26 kilometers) south of Hartford. In 1650, it was incorporated by English settlers as a town below its original Native American name, Mattabeseck, after the local original people, also known as the Mattabesett. They were accompanied by the many tribes along the Atlantic coast who spoke Algonquian languages. The colonists renamed the deal in 1653.

When Hartford County was organized upon May 10, 1666, Middletown was included within its boundaries. In 1784, the central unity was incorporated as a city certain from the town. Both were included within newly formed Middlesex County in May 1785. In 1923, the City of Middletown was consolidated as soon as the Town, making the city limits extensive.

Originally developed as a sailing port and then an industrial center on the Connecticut River, it is now largely residential. Its downtown, based on Main Street, serves as a popular retail, dining, and bar district close Wesleyan University. Middletown was the county seat of Middlesex County from its introduction in 1785 until the taking away of county management in 1960. As of the 2020 census, the city had a total population of 47,717. Making it the largest city outdoor of Fairfield County, Hartford County, and New Haven County. Middletown, Connecticut is considered the southernmost city in the Hartford-Springfield Knowledge Corridor Metropolitan Region, which features a accumulate metro population of 1.9 million. Middletown is largely a politically far along city, and is house to one of the largest pride endeavors in whatever of Connecticut.

The land upon the western bank of the Connecticut River where Middletown now lies was house to the Mattabesett Native Americans (also spelled Mattabesec, Mattabeseck, and Mattabesek); the area they inhabited—now Middletown and the surrounding area—was named after them. At the times the first European settlers arrived in the region, who were primarily English, the Mattabesett were a allowance of the group of Algongquian-speaking tribes in the Connecticut Valley, that were below a single chief named Sowheag.