Castrelo de Miño is a small municipality in the province of Ourense, in the autonomous community of Galicia, Spain. It belongs to the comarca of O Ribeiro.
The municipality is located in the northwestern part of the Iberian Peninsula, within the region of Galicia in northwestern Spain. Its administrative centre lies in the province of Ourense, the southernmost of Galicia's four provinces.
Castrelo de Miño forms part of the O Ribeiro comarca, a district known within Galicia as a wine-producing area. As a municipality, it is one of the smaller local administrative units in the province of Ourense.