San Jose Island or San José Island (also known as Saint Joseph Island) is a barrier island on the Gulf Coast of Texas in the United States. The island is about 21 miles (34 km) long and 5 miles (8 km) wide. The island is oriented generally northeast-southwest, with the Gulf of Mexico on the east and south, Aransas Bay on the west, and Mesquite Bay on the north. At the southern end of the island is Aransas Pass (not to be confused with the City of Aransas Pass which is on the mainland), beyond which is Mustang Island and the town of Port Aransas. Aransas Pass is protected by jetties extending into the Gulf from both Mustang Island and San José Island. The island's northern end used to be separated from Matagorda Island by Cedar Bayou.