The Middle Haddam Historic District is a historic district in the town of East Hampton, Connecticut. It encompasses the village center of Middle Haddam, a riverfront community founded in the 17th century on the east bank of the Connecticut River. It was an important port on the river between about 1730 and 1880. Its layout and architecture are reflective of this history, and by the geographic constraints of the local terrain. The district was listed on the National Register of Historic Places in 1984.