Percy Shelley was a poet of fiery politics who recognised the power of language to surprise and even shock. Across three centuries and around the globe, politicians and activists have turned to Shelley’s poetry for help furthering their political causes. With specific attention to poems like ‘The Mask of Anarchy’, ‘Song to the Men of England’, ‘England in 1819’, and ‘Ode to the West Wind’, as well as to critical prose pieces like ‘A Philosophical View of Reform’ and ‘A Defence of Poetry’, this chapter situates Shelley’s views on revolution and reform in their historical context and takes some tentative steps towards exploring why Shelley’s poems have so frequently been put to political purpose.