Gnojno [ˈɡnɔi̯nɔ] is a village in the administrative district of Gmina Działdowo, within Działdowo County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 10 kilometres (6 mi) south-west of Działdowo and 74 km (46 mi) south of the regional capital Olsztyn.