Sergeal Phillipe Petersen (born (1994-08-01)1 August 1994) is a South African rugby union player, currently playing with the Free State Cheetahs in domestic South African rugby and with the Cheetahs in Super Rugby. His regular position is winger.
He played for the Eastern Province Kings at all youth levels, representing them at the 2007 Under-13 Craven Week, the 2010 Under-16 Grant Khomo Week (scoring three tries in three games) and in the 2012 Under-18 Craven Week (scoring four tries in three games). His performances in the latter tournament earned him inclusion in the South African Schools team that played against France, Wales and England in August 2012. Petersen scored a try in each of those matches to ensure that the South African remained unbeaten in the series.