They historically spoke Pequot, a dialect of the Mohegan-Pequot language, which became extinct by the early 20th century. Some tribal members are undertaking revival efforts.

The Pequot and the Mohegan were formerly a single group, but the Mohegan split off in the 17th century as the Pequot came to control much of Connecticut. Simmering tensions with the New England Colonies led to the Pequot War