Old Fort Pierce Park, Military fort and park in Fort Pierce, Florida, US.

Old Fort Pierce Park is a former military fort and public park in Fort Pierce, Florida, situated on a raised bluff overlooking the Indian River estuary. The grounds contain remnants of 19th-century military structures along with much older Native American burial mounds.

Fort Pierce was built in 1838 as a supply depot for the U.S. Army during the Second Seminole War and named for its first commander, Benjamin Kendrick Pierce. Second Lieutenant William Tecumseh Sherman was stationed there. The post was abandoned in 1842 at the war's end and burned down the following year.

This location was once home to the Ais Indian people, whose traces remain visible in burial sites and artifacts throughout the grounds. Visitors can explore these remains and learn how the original inhabitants lived here.

The park sits on a bluff above the Indian River in Fort Pierce, with the Ais burial mound and fort site reachable on foot from the entrance. There is little shade on the open ground, so bring sun protection and water. Spanish relics and Indian potsherds have been found in the river nearby, but collecting is not permitted.

The burial mound is attributed to the Ais, whose territory ran from Cape Canaveral to the Saint Lucie inlet. A natural spring here drew the Ais and later Spanish sailors, who refilled water jars before the Atlantic crossing; Spanish relics and Indian potsherds still turn up mixed in the river bed.