Masłoniowizna [maswɔɲɔˈvizna] is a village in the administrative district of Gmina Żarki, within Myszków County, Silesian Voivodeship, in southern Poland. It lies approximately 8 kilometres (5 mi) north-west of Żarki, 10 km (6 mi) north of Myszków, and 51 km (32 mi) north-east of the regional capital Katowice.