Eastern Connecticut State University (Eastern, Eastern Connecticut, Eastern Connecticut State, or ECSU) is a public liberal arts university in Willimantic, Connecticut. Founded in 1889, it is the second-oldest campus in the Connecticut State University System and third-oldest public university in the state. Eastern is located on Windham Street in Willimantic, Connecticut, on 182 acres  30 minutes from Hartford, lying midway between New York City and Boston. Although the majority of courses are held on the main campus, select classes take place at Manchester Community College, Capital Community College, and a satellite center in Groton.

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Eastern Connecticut State University is a member of the Connecticut State Colleges and Universities, with governance provided by the Connecticut Board of Regents for Higher Education.