Rudnica (German Hammer - Solecka) is a village in Poland, in the Krzeszyce gmina, Sulęcin County, Lubusz Voivodeship. It is 4 km east of the village of Kołczyn and 14 km south-west of Gorzów Wielkopolski. It is located 1 km east of the Lubniewka River, a regional tributary of the Warta River, and 2 km southward from the railway line leading from Gorzów Wielkopolski to Kostrzyn nad Odrą. Rudnica is on the edge of the Sulęcińsko-Skwierzyński forests, to the south of Kołczyn.