Espadilla is a municipality in the comarca of Alto Mijares, in the Valencian Community of Spain. It is one of the small settlements that make up this inland comarca in the province of Castellón, in the northern part of the region.
The Valencian Community lies on the eastern Mediterranean coast of Spain, and Alto Mijares is an inland, mountainous comarca within it. Espadilla is therefore a rural municipality rather than a coastal resort, situated in the interior of the province.
As a municipality, Espadilla forms part of the local administrative structure of the Valencian Community, with its own municipal government. It is one of several small municipalities that together constitute the Alto Mijares comarca.