The French and Iroquois Wars, also called the Iroquois Wars or the Beaver Wars, commonly refer to a brutal series of conflicts fought in the mid-seventeenth century in eastern North America.

The Iroquois seek to expand their territory and monopolize the fur trade and the trade between European markets and the tribes of the western Great Lakes region.

The conflict pits the nations of the Iroquois Confederation, led by the dominant Mohawk, against the largely Algonquian-speaking tribes of the Great Lakes region.

The wars are extremely brutal and are considered one of the bloodiest series of conflicts in the history of North America.

The resultant enlargement of Iroquois territory realigns the tribal geography of North America, destroying several large tribal confederacies—including the Hurons, Neutrals, Eries, and Susquehannocks—and pushing other eastern tribes west of the Mississippi River.

The Ohio country and the Lower Peninsula of Michigan are virtually emptied of Native people, as refugees flee west to escape Iroquois warriors. (This region will be repopulated by these Ohio people not long after, although generally in multi-ethnic indigenous "republics" rather than homogenous, discrete "tribes".)

Both Algonquian and Iroquoian societies are greatly disturbed by these wars.

The conflict subsides with the loss by the Iroquois of their Dutch allies in the New Netherlands colony, and with a growing French desire to seek the Iroquois as an ally against English encroachment.

The Iroquois will subsequently become trading partners with the British, which is a crucial component of later British expansion.