Schalk Burger Geldenhuys (born 18 May 1956) is a South African former rugby union player.
Throughout his career he played for only one province, Northern Transvaal. Geldenhuys played 184 matches for Northern Transvaal and also captained his province 54 times.
In total, he played in seven tests for the Springboks and scored one try. His first test was as flanker on 29 August 1981 against the All Blacks at Athletic Park, Wellington. His seventh and final test occurred on 2 September 1989 against a World XV side at Ellis Park, Johannesburg.
He was inducted into the University of Pretoria sport hall of fame.