Castillo Formation

Castillo Formation can refer to:
 * Castillo Formation, Venezuela, an Early Miocene geologic formation in Venezuela
 * Castillo Formation, Argentina, a Cenomanian geologic formation in Argentina
 * Castillo Pedroso Formation, a Jurassic geologic formation in Spain
 * Cerro Castillo Formation, a Jurassic geologic formation in Argentina
 * Sierra del Castillo Formation, a Carboniferous geologic formation in Spain