Celestún is a town in Yucatán, Mexico. It is located in the northwest corner of the state, just north of Campeche, on the Gulf of Mexico. It is 60 miles away from the capital, Merida.

Surrounding the town is the 147,500-acre (600 km²) Parque Natural del Flamenco Mexicano (also known as the "Celestun Biosphere Reserve"), a wetland reserve that is the winter home to vast flocks of flamingos, as well as many herons and other bird species. In addition, approximately 300 species of birds pass through on migration, or live there. Celestun's ecosystem is unique because of a combination of fresh water from Celestun "river" and salt water from Gulf of Mexico.

Celestun's flamingos are the pinkest in the world due to high concentration of carotene in the water. The park also boasts two types of pelicans - large white Canadian and smaller gray Mexican ones. Boat tours of the estuary are available near the b ridge that links Celestun with the mainland. The standard tour of the park includes a "petrified" (salt deadened) forest, mangrove swamps, and "ojos de agua" (fresh water springs that visitors can swim in). It is also possible to arrange a night tour and see crocodiles. Celestun is also known as a hatching ground for endangered sea turtles. Wildlife conservationists have an ongoing project to protect the sea turtles from encroaching modernization.