Samuel de Champlain Provincial Park is a provincial park in Ontario, Canada. The park spans both sides of the Mattawa River. It has an area of 25.5 square kilometres (9.8 sq mi) and is about 14 kilometres (8.7 mi) west of Mattawa, Ontario, Canada. It is administered by Ontario Parks, which classifies it as a natural environment park. The park is named after Samuel de Champlain, one of the first French explorers of Canada of the 17th century.