Castus
Castus is the cognomen (or family name) of the following people:
- Gerbert Castus (* before 784, † after 819), pupil of Saint Liudger and missionary of the Saxons
- Lucius Artorius Castus , Roman officer
- Lucius Granius Castus , Roman suffect consul 142
- Marcus Aurelius Castus , Roman officer (imperial era)