Galveston Seawall, Protective seawall in Galveston, United States

The Galveston Seawall is a concrete seawall along the Gulf shore of Galveston, Texas, 10 miles (16 km) long, about 17 feet (5.2 m) high and 16 feet (4.9 m) thick at its base. Its vertical face curves into a long sloping surface marked by horizontal board-form lines, with a stepped buttress at one end. A sidewalk runs along its level top beside Seawall Boulevard.

The city built this barrier between 1902 and 1904 in response to the 1900 hurricane that claimed more than 6,000 lives. Engineers also raised the land behind the barrier to secure the urban area from future flooding.

The sidewalk on top of the seawall, running beside Seawall Boulevard (F.M. 3005), is claimed as the longest continuous sidewalk in the world at 10.3 miles. Many miles of the concrete face are painted with large murals made by children, showing underwater life. The wall was listed on the National Register of Historic Places in 1977 and named a National Historic Civil Engineering Landmark in 2001.

Access is available all along Seawall Boulevard, where parking and rest areas are located. Visitors can walk or cycle along the barrier and enjoy views of the Gulf of Mexico.

The barrier prevented an estimated 100 million dollars in damage during Hurricane Alicia in 1983. It was later extended several times and is now one of the longest coastal protection structures in North America.