Billy Barnes (20 May 1879 – 1962) was a professional footballer from West Ham, Essex. Originally debuting for Thames Ironworks, he moved to Sheffield United and scored the winning goal in the 1902 FA Cup final replay. Later on in his career he won two Southern Football League titles and took part in two Charity Shield matches including the first time it was held. Once his playing career was over, he went on to manage Athletic Bilbao in Spain.