Zembrzus-Mokry Grunt [ˈzɛmbʐus ˈmɔkrɨ ˈɡrunt] is a village in the administrative district of Gmina Janowo, within Nidzica County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 18 kilometres (11 mi) south-east of Nidzica and 57 km (35 mi) south of the regional capital Olsztyn.