The Kitsai, also spelled Kichai, are a Native American people group related to the Caddo peoples.

The Kitsai language is no longer spoken and very was recorded before the last Kitsai speaker passed away in the 1930s.

Historically, they were farmers and hunters. Throughout their history during the 18th and early 19th centuries, they were relatively few in number and divided into two groups, a northern band allied with the Wichita, and a southern band allied with the Cadohadacho and other Caddo groups. Their known territory was in south-central Oklahoma and north-central Texas, just west of the Caddo, especially along the Red River.

Present day Kitsai are not a distinct federally recognized tribe, but they are instead enrolled in the Caddo Nation of Oklahoma and Wichita and Affiliated Tribes. They reside in southwest Oklahoma.