Sumiak [ˈsumjak] (German: Kleefeld) is a village in the administrative district of Gmina Nowogródek Pomorski, within Myślibórz County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 2 kilometres (1 mi) south of Nowogródek Pomorski, 12 km (7 mi) east of Myślibórz, and 65 km (40 mi) south-east of the regional capital Szczecin.

For the history of the region, see History of Pomerania.