Arethousa (Greek: Αρέθουσα) is a village and a community and a municipal unit of the Volvi municipality.

[2] Before the 2011 local government reform it was part of the municipal unit of Arethousa was an independent municipality.

[2] The 2021 census recorded 636 inhabitants in the community and 2,238 inhabitants in the municipal unit.

[1] The community of Arethousa covers an area of 57.021 km2 while the respective municipal unit 214.929 km2.

[3] The community of Arethousa consists of two separate settlements:[1]