Opalenica[ɔpalɛˈɲit͡sa] is a town in Nowy Tomyśl County, Greater Poland Voivodeship, Poland, with 9,861 inhabitants (2007).
The noble de Opalenica Opaliński (also de Bnin Opaliński) family originated here as lords of the area and a branch of the de Bnin Bniński family of Clan Łodzia.