Percy Alfred Williams was a Canadian athlete, winner of the 100 and 200 metres races at the 1928 Summer Olympics and a former world record holder for the 100 metres sprint.

The 1928 Summer Olympics, officially known as the Games of the IX Olympiad and commonly known as Amsterdam 1928, was an international multi-sport event that was celebrated from 28 July to 12 August 1928 in Amsterdam, Netherlands. The city of Amsterdam had previously bid for the 1920 and 1924 Olympic Games, but was obliged to give way to war-torn Antwerp in Belgium for the 1920 Games and Pierre de Coubertin's Paris for the 1924 Games.