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Mark Williams (politician) - British Member of Parliament for Ceredigion

Mark Williams (snooker player) - professional snooker player

Mark Williams (actor) - British actor and comedian

Mark Melville "Choco" Williams - Australian rules football (coach of Port Adelaide, player with Brisbane and Collingwood)

Mark L. Williams - Australian footballer (player with Hawthorn)

Mark Williams (radio host) - radio host in California

Mark Williams (soccer player) - South African footballer

Mark Williams (soccer player of NI) - Northern Ireland footballer