Cleora is an unincorporated community and census-designated place (CDP) in Delaware County, Oklahoma, United States, along State Highway 85. As of the 2020 census, Cleora had a population of 1,220. The Cleora Post Office existed from November 28, 1900, until October 15, 1954. Cleora was established in District 2 of the old Indian Territory. It was named for Cleora Ann Lunday, sister of the postmaster, Ed Lunday.