Popielno [pɔˈpjɛlnɔ] (German: Spirding; until 1928: Popiellnen) is a settlement in the administrative district of Gmina Ruciane-Nida, within Pisz County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 13 kilometres (8 mi) north of Ruciane-Nida, 20 km (12 mi) north-west of Pisz, and 74 km (46 mi) east of the regional capital Olsztyn.

The settlement has a population of 180.