Point Isabel Lighthouse, Historic lighthouse in Port Isabel, Texas.

Point Isabel Lighthouse is a cylindrical brick tower 17 m (56 ft) tall, with a gallery and lantern on top; the tower is white and the gallery and lantern are black. It was built in 1852 to guide ships through the Brazos Santiago Pass into Port Isabel. A third-order Fresnel lens was installed in 1857.

Congress authorized $15,000 for a light at Brazos Santiago Pass on September 28, 1850, and work began in February 1852 on an 82-foot brick tower. Soldiers from both sides used it as a lookout during the Civil War, and it was refitted and relit in 1866. Claimants proved the government lacked title to the land, so the light went dark in 1888 until the land was condemned in 1894; it returned on July 15, 1895, then was extinguished in 1905. Mr. and Mrs. Lon C. Hill Jr. gave it to the Texas State Park Board on October 5, 1950, and it opened to the public in 1952.

The lighthouse is owned by the Texas Historical Commission but operated by the City of Port Isabel, and since 1952 it has been open to the public as a state historic site. A visitors center completed in September 1996 is a replica of the old keeper's house and holds a small museum. The tower was relit privately in 2018 after a long restoration.

You can climb the interior staircase to reach the viewing platform at the top, which offers clear views of the Gulf and surrounding barrier islands on sunny days. The site is walkable from the town center and has parking available nearby for visitors.

The 1857 third-order Fresnel lens no longer survives: a reproduction was installed on 16–17 November 2022, with a celebration held on 9 December 2022. The original optic had long since left the tower, so what visitors see today is a modern copy of the 19th-century system.