Pyhä-Häkki National Park (Pyhä-Häkin kansallispuisto) is a national park located in Saarijärvi, Central Finland. It was created in 1956 and expanded in 1982 when the area of Kotaneva was added to it. The park covers an area of 13 square kilometers (5 square miles). Plans to establish the park were made in the late 1930s, but these plans were delayed due to the Second World War.

The national park protects old forests of Scots pine and Norway spruce that began growing during the time Finland was ruled by Sweden. It also includes bogs, which cover half of the park’s area. Pyhä-Häkki National Park is the largest remaining area of untouched forest in the southern part of Finland. In addition to Scots pine and Norway spruce, other tall tree species found in the park include Betula pendula, Betula pubescens, Populus tremula, and Alnus glutinosa, which grows near some streams.