The Pennamite–Yankee Wars or Yankee–Pennamite Wars were a series of conflicts consisting of the First Pennamite War (1769–1770), the Second Pennamite War (1774), and the Third Pennamite War (1784), in which settlers from Connecticut (Yankees) and Pennsylvania (Pennamites) disputed for control of the Wyoming Valley along the North Branch of the Susquehanna River. Both colonies and later states declared that their original land grants gave them control of this territory.

The U.S. state of Connecticut began as three distinct settlements of Puritans from Massachusetts and England; they combined under a single royal charter in 1663. Known as the "land of steady habits" for its political, social and religious conservatism, the colony prospered from the trade and farming of its ethnic English Protestant population. The Congregational and Unitarian churches became prominent here. Connecticut played an active role in the American Revolution, and became a bastion of the conservative, business-oriented, Constitutionalism Federalist Party.