Roger D. Griffin (born 31 January 1948) is a British academic political theorist at Oxford Brookes University, England. His recent efforts have focused on a definition and examination of fascism. He has also translated works by Norberto Bobbio and Ferruccio Rossi-Landi.

Griffin's theory of fascism suggests that a heuristically useful ideal type of its definitional core is that it is a form of palingenetic ultranationalism. In other words it seeks, by directly mobilizing popular energies or working through an elite, to eventually conquer cultural hegemony for new values, to bring about the total rebirth of the nation from its present decadence, whether the nation is conceived as a historically formed nation-state or a racially determined 'ethnos'. Conceived in these terms, fascism is an ideology that has assumed a large number of specific national permutations and several distinct organizational forms. Moreover, it is a political project that continues to evolve to this day throughout the Europeanized world, though it remains highly marginalized compared with the central place it occupied in inter-war Europe.