Simeon Oscar Williamson (born 16 January 1986) is an English bobsledder and former track and field sprinter who specialised in the 100 metres. Williamson, a London native, is the second cousin to 2008 Beijing Olympics silver medalist British high jumper Germaine Mason. He is coached by Lloyd Cowan, and his athletics club is Highgate Harriers. He is a former British 100 metres champion.