Twardzik is a surname. Notable people with the surname include:
Dan Twardzik (born 1991), Czech footballer with MotherwellDave Twardzik (born 1950), American basketball playerDick Twardzik (1931–1955), American jazz pianistFilip Twardzik (born 1993), Czech footballer with CelticPatrik Twardzik (born 1993), Czech footballer with LivingstonRené Twardzik (born 1970), Czech retired footballer