Estero Bay (Spanish for "Estuary") is a bay located on the Pacific Coast in San Luis Obispo County, central California. It is about 15 miles (24 km) from its south end at Point Buchon/Montana de Oro State Park, to its north end at Point Estero, which is about 5 miles (8 km) northwest of Cayucos. It is indented about 5 miles (8 km) into the California coast.