Claude Jean Allouez, SJ (June 6, 1622 – August 28, 1689) was a Jesuit missionary and French explorer of North America.

Allouez arrived in Quebec in 1658 and immediately began a study of the Wyandot and Anishinaabe languages to prepare himself for work as a missionary among the American Indian tribes along the St. Lawrence River.

His stay there lasted until 1663 when he was named vicar general of a part of the diocese of Quebec that is now the central region of the United States.

Marie, Michigan, he was a principal speaker at the ceremony that formally declared the Great Lakes and the Mississippi River valley as territory of the King of France.

[2] In 1671 he founded the St. Francis Xavier Mission at the last set of rapids on the Fox River before entering Green Bay.

He continued Marquette's evangelizing of the Indians until his death in 1689, near what is today Niles, Michigan just north of South Bend, Indiana.