Order †Pachycephalosauria Maryañska & Osmólska, 1974 see Infraorder Pachycephalosauria Maryañska & Osmólska, 1974
   Family †Pachycephalosauridae Sternberg, 1945
     0 Genus †Stenopelix Meyer, 1857
     01 Genus †Alaskacephale Sullivan, 2006
     02 Genus †[Colepiocephale] Sullivan, 2003
     03 Genus †[Goyocephale] Perle, Maryanska & Osmólska, 1982
     04 Genus †[Hanssuesia] Sullivan, 2003
     05 Genus †[Homalocephale] Maryañska & Osmólska, 1974
     06 Genus †Prenocephale Maryañska & Osmólska, 1974
     06.0.1 Genus †Sphaerotholus Williamson & Carr, 2002 see Genus Prenocephale Maryañska & Osmólska, 1974
     06.0.1.0.1 Genus †Sphaerolothus see Genus Sphaerotholus Williamson & Carr, 2002
     06.0.1.0.2 Genus †Sphaerolotholus see Genus Sphaerotholus Williamson & Carr, 2002
     06.0.2 Genus †Stegoceras Lambe, 1902
     08 Genus †[Tylocephale] Maryañska & Osmólska, 1974
     09 †Pachycephalosaurini Sullivan, 2003
     10 ?Genus †[Wannanosaurus] Hou, 1977
     11 Genus †Gravitholus Wall & Galton, 1979, nom. dub.
     12 Genus †Ferganocephale Averianov, T. Martin & Bakirov, 2005, nom. dub.
     13 Genus †Heishansaurus Bohlin, 1953, nom. dub.
     14 Genus †[Micropachycephalosaurus] Dong, 1978, nom. dub.