Mechnica [mɛxˈnit͡sa] is a village in the administrative district of Gmina Reńska Wieś, within Kędzierzyn-Koźle County, Opole Voivodeship, in south-western Poland. It lies approximately 11 kilometres (7 mi) north-west of Reńska Wieś, 13 km (8 mi) north-west of Kędzierzyn-Koźle, and 31 km (19 mi) south of the regional capital Opole.