Hallyeohaesang National Park (Korean: 한려해상국립공원; Hanja: 閑麗海上國立公園) is a national park in Yeosu, South Korea.

It has six districts: Sangju-Geumsan Mountain, Namhaedaegyo, Sacheon, Tongyeong-Hansan, Geoje-Haegeumgang, and Yeosu-Odongdo.

[1] The national park is known to have 1,142 species of plants including Korean red pine, Japanese black pine, common camellia, serrata oak, cork oak as well as rare species such as nadopungnan (Sedirea japonica), daeheongnan (Cymbidium nipponicum) and the Korean winter hazel.

[3] In February 2015, a North Pacific right whale, one of the rarest and most endangered whales in the world, was entangled in a mussel farm, and possibly fled from it later in nearby (within Namhae County).

[4][5] This was the first record of the species in 41 years in South Korea, since the catch off the east coast, and was possibly the first official record of a live animal in the Sea of Japan (East Sea) in modern times.