Constantine Doukas (disambiguation)

Constantine X Doukas (1006–1067) was emperor of the Byzantine Empire from 1059 to 1067.

Constantine Doukas or Constantine Ducas may also refer to:
 * Constantine Doukas (usurper) (died 913), Byzantine general
 * Constantine Doukas (co-emperor), Byzantine co-emperor, son of Emperor Michael VII Doukas
 * Constantine Doukas (died 1179), Byzantine general and governor
 * Constantine Makrodoukas (died 1185), Byzantine nobleman and general
 * Constantine Angelos Doukas, Byzantine usurper against Isaac II Angelos in 1193
 * Constantine Komnenos Doukas, ruler of Acarnania and Aetolia from 1215 to after 1242
 * Constantine Doukas of Thessaly, ruler of Thessaly from 1289 to 1303
 * Constantine Ducas (Moldavian ruler), prince of Moldavia in 1693–1695 and 1700–1703