Blatnik pri Črmošnjicah (pronounced [ˈbláːtnik pɾi tʃəɾmɔˈʃnjìːtsax, -njíː-]; German: Rußbach) is a small settlement in the Municipality of Semič in Slovenia. It was inhabited by Gottschee Germans that were mostly expelled in 1941 during the Second World War. The area is part of the historical region of Lower Carniola. The municipality is now included in the Southeast Slovenia Statistical Region.