Castellonet de la Conquesta is a municipality in the comarca of Safor, within the Valencian Community of Spain. It is located in the eastern part of the Iberian Peninsula, in the province of Valencia.
The town is one of the smaller municipalities that make up the Safor comarca, a coastal region whose administrative centre is the city of Gandia. Like other settlements in the area, it forms part of the Valencian Community, one of Spain's seventeen autonomous communities.