Mustang Island is a barrier island on the Gulf Coast of Texas in the United States. The island is 18 miles long, stretching from Corpus Christi to Port Aransas. The island is oriented generally northeast-southwest, with the Gulf of Mexico on the east and south, and Corpus Christi Bay on the north and west. The island’s southern end connects by roadway to Padre Island. At the northern end of the island is Port Aransas, beyond which is San José Island. Aransas Pass, formed by the separation of Mustang and San José islands, is protected by jetties extending into the gulf from each island.

Seaside beaches stretch for five miles along the open Gulf of Mexico, inviting a perfect summer-at-the-shore experience. This is truly one of the best places to see coastal marine life, from stingrays to blue herons. Primitive beach camping is on a first-come, first-served basis. There are rinse showers, bulk water and portable toilets in convenience stations along the beach.

A 3,954 acre coastal barrier island that has a unique and complicated ecosystem, dependent upon sand dunes. Many activities are available at this island park including camping, picnicking, fishing, swimming, hiking, sunbathing, surfing, excellent birding, and mountain biking, as well as five miles of open beach. Interpretive ecological tours are available upon request.

The town of Port Aransas, Texas is located at the northern end of the island. Mustang Island State Park encompasses the entire southern third of the island, including 3954 acres and 5 miles of beach. The city of Corpus Christi includes the northernmost portion of Padre Island and part of Mustang Island between Port Aransas and the state park.

The island is a popular Spring Break destination for its beaches.