Oscar is a small rural unincorporated community in southern Jefferson County, Oklahoma, United States, three miles north of the Red River. The town was named after Oscar W. Seay, a local rancher. The post office opened on November 23, 1892. The ZIP Code is 73561. The first Postmaster was William Riley Butler, by presidential appointment. The population is unknown.

• Shirk, George H. Oklahoma Place Names. Norman: University of Oklahoma Press, 1987. ISBN 0-8061-2028-2