right|thumb|300px|Haeo Suwat waterfall in [[Khao Yai National Park, Thailand's first national park, designated in 1961.]]

National parks in Thailand () are defined as areas that contain "natural resources of ecological importance or unique beauty, or flora and fauna of special importance". Thailand's protected areas included 156 national parks, 58 wildlife sanctuaries, 67 non-hunting areas, and 120 forest parks. They cover almost 31 percent of the kingdom's territory.

  • National Park, Wildlife and Plant Conservation Department
  • The former National Park Division of the Forest Department
  • The former Marine National Park Division of the Forest Department
  • List of Thailand National parks
  • Birdwatching sites in Thailand