Fort Tigné is a polygonal fort in Tigné Point, Sliema, Malta. It was built by the Order of Saint John between 1793 and 1795 to protect the entrance to Marsamxett Harbour, and it is one of the oldest polygonal forts in the world. The fort was extensively altered by the British in the 19th century, and it remained in use by the military until 1979.

A polygonal fort is a type of fortification originating in France in the late 18th century and fully developed in Germany in the first half of the 19th century. Unlike earlier forts, polygonal forts had no bastions, which had proved to be vulnerable. As part of ring fortresses, polygonal forts were generally arranged in a ring around the place they were intended to protect, so that each fort could support its neighbours. The concept of the polygonal fort proved to be adaptable to improvements in the artillery which might be used against them, and they continued to be built and rebuilt well into the 20th century.