Trześniów [ˈtʂɛɕɲuf] is a village in the administrative district of Gmina Ośno Lubuskie, within Słubice County, Lubusz Voivodeship, in western Poland. It lies approximately 7 kilometres (4 mi) north-east of Ośno Lubuskie, 31 km (19 mi) north-east of Słubice, 35 km (22 mi) south-west of Gorzów Wielkopolski, and 71 km (44 mi) north-west of Zielona Góra.