Pierre Semard (15 February 1887, Bragny-sur-Saône, Saône-et-Loire - 7 March 1942, Évreux, Eure) was a trade unionist, secretary general of the federation of railway-workers and leader of the French Communist Party (acting as its secretary general from 1924 to 1928). He was shot in prison by the Germans in 1942, and is buried at the Père Lachaise Cemetery in Paris. He was key figure in the French Section of the Workers' International (SFIO) and a trade unionist in the Confédération générale du travail unitaire (CGTU) and Confédération générale du travail (CGT).