Santiago Formation may refer to: Santiago Formation, Bolivia, a Late Ordovician geologic formation of Bolivia Santiago Formation, California, a Late Eocene to Late Oligocene geologic formation of California Santiago Formation, Chiapas, a Late Jurassic to Early Cretaceous geologic formation in Chiapas, Mexico Santiago Formation, Oaxaca, a Carboniferous geologic formation in Oaxaca, Mexico Santiago Formation, Panama, a Late Oligocene geologic formation of Panama