The Third Force (Troisième Force) was a French coalition during the Fourth Republic (1947 – 1958) which gathered the French Section of the Workers' International (SFIO) party, the centre-right Democratic and Socialist Union of the Resistance (UDSR), the Radicals, the Christian democrat Popular Republican Movement (MRP) and other centrist politicians, opposed both to the French Communist Party (PCF) and the Gaullist movement.