Taean Seaside National Park () in Taean County, South Chungcheong Province, South Korea. It was designated the country's 13th National Park in 1978. The total area is about , with being marine area.
It contains various coastal ecosystems and variety of coastal landmarks such as 26 beaches, sand dunes, rocky formations, and 72 islands along the 230 km coastline.
Regarding the natural resources, 1,195 animal species, 774 plant species, and 671 marine species including minke whales and finless porpoises are distributed within this national park. Endangered species include Eurasian otter, Chinese egret, Eremias argus, and the Seoul frog, Ranunculus kazusensis.