Caesarius may refer to:
- Caesarius of Africa, 3rd century Christian
- Caesarius of Nazianzus, physician and politician of the 4th century, and the younger brother of Gregory of Nazianzus
- Caesarius (consul 398), Roman politician, twice Praetorian prefect of the East, Consul in 398 and Patricius.
- Caesarius of Arles, 5th century ecclesiastic in Gaul
- Caesarius of Heisterbach, 13th century Christian
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