King Philip's War was an armed conflict in 1675–1676 between indigenous inhabitants of New England and New England colonists and their indigenous allies. The war is named for Metacom, the Wampanoag chief who adopted the name Philip because of the friendly relations between his father Massasoit and the Mayflower Pilgrims. The war continued in the most northern reaches of New England until the signing of the Treaty of Casco Bay on April 12, 1678.

The war was the greatest calamity in seventeenth-century New England and is considered by many to be the deadliest war in Colonial American history. In the space of little more than a year, 12 of the region's towns were destroyed and many more were damaged, the economy of Plymouth and Rhode Island Colonies was all but ruined and their population was decimated, losing one-tenth of all men available for military service. More than half of New England's towns were attacked by Natives. Hundreds of Wampanoags and their allies were publicly executed or enslaved, and the Wampanoags were left effectively landless.

King Philip's War began the development of an independent American identity. The New England colonists faced their enemies without support from any European government or military, and this began to give them a group identity separate and distinct from Britain.