The Grand Gulf Military Monument Park is a state park, recreation area, and historic site in Port Gibson, Mississippi. The park marks and preserves the site where the old city of Grand Gulf once stood.

The Grand Gulf Military Monument Park traces its roots back to the 1700 when it was first settled by French immigrants. It took its name from the bend of the Mississippi River and a large whirlpool that was once located near the park and has since slightly shifted course. In the 1800s, it became a developing city, although tragedies like a yellow fever epidemic and a massive tornado brought it to ruins. The site was also where the Battle of Grand Gulf took place.

The Grand Gulf Military Monument Park is now open for tours. It is also a Mississippi Landmark and is listed on the National Register of Historic Places.