Kozelshchynskyi Raion (Ukrainian: Козельщинський район; translit.: Kozelshchynskyi raion) is a raion (district) in the central Ukrainian province of Poltava. The raion's administrative center is the city of Kozelshchyna. The other main city is Nova Haleshchyna (Ukrainian: Нова Галещина).Important rivers within the Kozelshchynskyi Raion include the Psel river.