In Greek mythology, Ctesius (Ancient Greek: Κτήσιος means 'belonging to property, acquisition') may refer to three distinct characters:
Praxidike (Exacter of Justice): A deity whose head alone is venerated. Mnaseas in his treatise On Europe says that Soter (Saviour) and his sister Praxidike (Exacter of Justice) had a son Ctesius (Household) and daughters Homonoia (Concord) and Arete (Virtue), who were called Praxidikai (Exacters of Penalties) after their mother.