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The San Blas jay (Cyanocorax sanblasianus) is a species of bird in the family Corvidae. It is endemic to Mexico where its natural habitat is subtropical or tropical dry forests. This jay is endemic to Mexico. There are two subspecies; C. s. nelsoni is found in southwestern Mexico, from Nayarit, Jalisco and Colima southward to western Guerrero; and C. s. sanblasianus is found in the coastal region of Guerrero. The habitat includes dry and semi-moist woodland, thickets, groves and plantations as well as mangrove areas. This bird is not found deep in the forest.