Classification of Williamson and Carr 2006

Subor. †Pachycephalosauria Maryańska and Osmólska 1974
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G. †Goyocephale Perle et al. 1982
G. †Homalocephale Maryańska and Osmólska 1974
G. †Stenopelix Meyer 1857
G. †Wannanosaurus Hou 1977
G. †Yaverlandia Galton 1971
Fm. †Pachycephalosauridae Sternberg 1945
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Subfm. †Pachycephalosaurinae Sereno 1997
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G. †Pachycephalosaurus Brown and Schlaikjer 1943
G. †Prenocephale Maryańska and Osmólska 1974
G. †Sphaerotholus Williamson and Carr 2003
G. †Stygimoloch Galton and Sues 1983
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Stygimoloch spinifer Galton and Sues 1983
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Invalid names: Stenotholus kohleri Giffin et al. 1988 [synonym]
Invalid names: Stenotholus Giffin et al. 1988 [synonym]
G. †Tylocephale Maryańska and Osmólska 1974
G. †Stegoceras Lambe 1902
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Stegoceras sternbergi Brown and Schlaikjer 1943
Invalid names: Colepiocephale Sullivan 2003 [synonym], Gravitholus Wall and Galton 1979 [synonym], Hansuessia Sullivan 2003 [synonym], Ornatotholus Galton and Sues 1983 [synonym]
Stegoceras validum Lambe 1902
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Invalid names: Ornatotholus browni Wall and Galton 1979 [synonym]