Caesarius may refer to:
Caesarius of Africa (died c. 3rd century), a Christian martyr Caesarius (consul) (fl. 386-403), Eastern-Roman politician Caesarius of Arles (468/470 – 542), ecclesiastic in Gaul Owain Caesarius, possibly Owain ap Dyfnwal (fl. 934) Caesarius of Nazianzus (), physician and politician Caesarius of Alagno (died 1263), a Roman Catholic priest, bishop and royal counsellor Caesarius of Heisterbach, 13th-century Christian
See also