Tongpan Island is an island in Tongpan Village, Magong City, Penghu County, Taiwan. Tongpan Island is about 6 nmi (11 km) from the main island of Penghu. A ferry runs between Tongpan Island and Penghu Main Island twice a day and more often at some times. The island is a basalt mesa landform with a shoreline of cliffs made of basalt columns. These geological formations make it "The Yellowstone Park of the Penghu". The columns can be seen in a path around the island. The southwest side of the island has a stepped basin known as "Lotus Terrace" (蓮花臺). There is a beehive-shaped basalt formation on the island called "Cat Rock" (貓公石). There are coral reefs on the nearby seabed which can be seen by snorkelling.

Magong is a county-administered city and seat of Penghu County, Taiwan. Magong City is located on Penghu's main island.