Constantius

Constantius may refer to:

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Roman people

Constantius I "Chlorus" ({{circa|250}}–306), Western Roman emperor from 305 to 306
Julius Constantius (died 337), consul in 335, son of Constantius I
Constantius Gallus (325–354), caesar from 351 to 354 and consul from 352 to 354, son of Julius Constantius
Constantius II (317–361), emperor from 337 to 361, grandon of Constantius I
Constantius III, Western Roman emperor in 421
Constantius Ducas, Eastern/Byzantine co-emperor from 1060 to 1078

Saints Simplicius, Constantius and Victorinus (died c. 159), Christian martyrs
Saint Constantius of Perugia (died c. 170), one of the patron saints of Perugia, Italy
Saint Constantius (Theban Legion) (c. 3rd century), a member of the legendary Theban Legion
Constantius of Lyon ({{fl.|c. 480}}), cleric who wrote the Vita Germani, a hagiography
Saint Constantius of Aquino, 6th century bishop of Aquino
Saint Constantius of Capri (died 7th or 8th century), Bishop of Capri

Constantius Africanus, ({{circa|1020}}{{snd}}1085), translator of Greek and Islamic medical texts