Alt Maestrat (Valencian: [ˈald maesˈtɾat]; Spanish: Alto Maestrazgo [ˈalto maesˈtɾaθɣo]) is a comarca in the province of Castellón, Valencian Community, Spain.

The comarca of Alt Maestrat is composed of nine municipalities, listed below with their populations at the 2001 and 2011 Censuses, and according to the most recent official estimates (for 1 January 2019):

40°21′23″N 0°01′31″E / 40.35639°N 0.02528°E / 40.35639; 0.02528