Stéphane Demilly (born 26 June 1963 in Albert, Somme) is a French politician of the Union of Democrats and Independents (UDI) who served as a member of the National Assembly of France from 2002 until 2020, representing the Somme department. From June 2017, Demilly co-chaired the UDI and Independents group in the National Assembly, alongside Franck Riester.