Zimna [ˈʑimna] (German: Kaltenfließ) is a settlement in the administrative district of Gmina Pisz, within Pisz County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 18 kilometres (11 mi) south-west of Pisz and 85 km (53 mi) south-east of the regional capital Olsztyn.