The Iowa or Ioway are a Native American Siouan people. Today, they are enrolled in either of two federally recognized tribes, the Iowa Tribe of Oklahoma and the Iowa Tribe of Kansas and Nebraska.

The Iowa, Missouria, and Otoe tribes were all once part of the Ho-Chunk people. They are all Chiwere language-speaking peoples. They left their ancestral homelands in Southern Wisconsin for Eastern Iowa, a state that bears their name.

In 1837, the Iowa were moved from Iowa to reservations in Brown County, Kansas, and Richardson County, Nebraska. Bands of Iowa moved to Indian Territory in the late 19th century and settled south of Perkins, Oklahoma to become the Iowa Tribe of Oklahoma.