Pyriatyn National Nature Park (Ukrainian: Пирятинський національний природний парк) is a national park of Ukraine that covers a portion of the Udai River valley in the north central part of the country.

The park is about 130 km east of Kyiv, and is in the administrative district of Pyriatyn in Poltava Oblast.

The terrain is typical of river valleys in the East European Plain, with forest-steppe character on the slopes and wetlands on the floodplains and terraces.

[4] Being centered along a river valley, the park displayed a variety of wetlands, with river and riverbank habitat at the lowest levels, reed beds on the floodplains, mesotrophic laves and streams on the terraces, and forest-steppe where drainage permits.

Preliminary scientific inventories of plants and animals are underway, and the park sponsors educational programs for local schools.