Wolnzach (German pronunciation:[ˈvɔlntsax], locally [ˈvɔɪntsɔ(x)]) is a municipality in the district of Pfaffenhofen in Bavaria, Germany. It is also a "seal district" ("Siegelbezirk") of the hop-planting area Hallertau, and home of important hops-related institutions like the German Hops Museum ("Deutsches Hopfenmuseum").