The Mullendore Mansion is a two-and-one-half-story Greek Revival structure in Cleveland, Oklahoma. Listed on the National Register of Historic Places listings in Pawnee County, Oklahoma in 1984, it was built in 1910 on 16 acres (6.5 hectares) overlooking the Arkansas River by E. C. Mullendore, an influential Oklahoma rancher and banker, who used it as his home until his death in 1938.

• E.C. Mullendore III