Sean Colin Williams is a Zimbabwean international cricketer who is a former captain of the national team in Test cricket. He plays Tests and One Day Internationals, and formerly T20Is, primarily as a batting all-rounder. In September 2019, Zimbabwe Cricket named him as Zimbabwe's captain, after Hamilton Masakadza retired from international cricket. Later the same month, Williams captained Zimbabwe for the first time, in the opening Twenty20 International (T20I) match of the 2019–20 Singapore Tri-Nation Series, against Nepal.

He was expected to be called up at the time of the players' strike in April 2004. Almost a year later, and with just one first-class match, he was drafted into the Zimbabwe squad to tour South Africa.

He attended Falcon College in Esigodini, Zimbabwe and Petra High School in Bulawayo, Zimbabwe. His father is Collin Williams, a former first-class cricketer and a national field hockey coach, and his brother Matthew Williams has played first-class cricket in Zimbabwe for Matabeleland Tuskers. His mother Patricia McKillop, was a field hockey player, who was a member of the Zimbabwe national team that won the gold medal at the 1980 Summer Olympics His step brother, Michael McKillop is also a first-class cricketer and a field hockey player who played for Matabeleland and also served as the captain of the Zimbabwe men's national field hockey team.