The Tasman National Park is a national park in eastern Tasmania, Australia, approximately 56 kilometres (35 mi) east of Hobart. The 107.5-square-kilometre (41.5 sq mi) park is situated on part of both the Forestier and Tasman peninsulas and encompasses all of Tasman Island.

Whaling activity took place in the 1830s and 1840s.

The prominent cliffs with dolerite columns at Cape Raoul were damaged by gunnery practice by warships of the Royal Navy's Australia Station in the late 1800s.

The park was proclaimed under the Regional Forest Agreement on 30 April 1999. The Tasman Island Lighthouse (constructed in 1906) is located on Tasman Island, which is part of the park. This lighthouse and weather station has been unmanned since 1977.

At 300 metres (980 ft) above sea level, the columnar dolerite cliffs at Cape Pillar and Tasman Island are among the highest in the world. Dolerite is a rare rock type on mainland Australia. Land formations accessible by road include the Blowhole (a hole at the inland end of a sea cave), Devils Kitchen (a rock hole) and Waterfall Bay. Dolerite formations which are more easily viewed from the ocean include Cathedral Rock, Totem Pole, Candlestick, and Tasmans Arch. The park includes The Lanterns, three small islands.

Three species of Euphrasia (a semi-parasitic, herbaceous flowering plant commonly known as eyebright) are found only in Tasman National Park. The rare Cape Pillar Sheoak is a shrub or small tree found only in the Tasman National Park where it is restricted to the Cape Pillar area of the Tasman Peninsula and to Tasman Island.

Giant Kelp is locally extinct in Eaglehawk Neck since 2016 due to climate change, with Tasmania's remaining giant kelp forests predicted to disappear in the next five to ten years.

Australian fur seals use the coastline for breeding and resting, and little penguins (sometimes referred to as "blue penguins" or "fairy penguins") nest along the foreshore.