Pieter Johannes Frederik 'Piet' Greyling, born 16 May 1942 in Zastron, South Africa, is a South African rugby union player who has represented the national team, the Springboks, 43 times, captaining them once, and scoring 5 tries in total.
Greyling has been described as one of the best and toughest flanks, and is best known for his pairing with Jan Ellis in 24 tests.