The National Front for the Defence of the Constitution (French: Front National pour la Défense de la Constitution, FNDC) is a Guinean opposition coalition founded in 2019 initially in opposition to proposed amendments to the country's constitution by its then-President, Alpha Condé. It played a leading role in the organisation of the 2019–2020 Guinean protests, a series of demonstrations and civil unrest that occurred throughout the country. Following the 2021 coup d'état by the Guinean Armed Forces, the FNDC has been a prominent voice calling for the restoration of democratic rule in Guinea.