Byars is a town in McClain County, Oklahoma, United States.

The present community of Byars is one mile southeast of the Camp Arbuckle site in what is now McClain County.

Thomas B. Johnson, Chief Justice of the Chickasaw Nation, lived in Johnsonville, his daughter, Katie, married Nathan H. Byars, another local rancher.

Katie Byars and her husband donated land to be used for this purpose, despite opposition from their neighbors in Johnsonville.

Byars incorporated in 1906, and the OCR main line reached the town site in July 1908.