Casparus Cornelius "Corniel" van Zyl (born 27 January 1979) is a South African-born Italian former rugby union footballer who played at lock. Van Zyl was part of the Italian squad at the 2011 Rugby World Cup. He is currently a coach at Premiership Rugby side London Irish. He played for Italian side Treviso for eight seasons from 2007 to 2015 before retiring as a player to become the forwards coach at the Free State Cheetahs. Van Zyl left the Free State Cheetahs in 2020 and joined London Irish as an assistant coach on 30 January 2021.