Tylocephale meaning (Swollen Head), is a genus of pachycephalosaurid dinosaur from the Late Cretaceous Period. It was a herbivorous dinosaur estimated to have been about 1.4 metres (4.6 ft) in length and had the most tallest dome of any known pachycephalosaur. Tylocephale lived during the Campanian stage of the Late Cretaceous, around 75 million years ago. It was discovered in the Khulsan region of Mongolia. The type species is T.gilmorei, described by Maryanska and Osmolska in 1974.