Geldenhuys is a surname. Notable people with the surname include:
Boy Geldenhuys (born 1941), South African politician Burger Geldenhuys (born 1956), South African rugby union player Hendrik Geldenhuys (born 1983), Namibian cricketer Johannes Geldenhuys (1935–2018), South African military commander Preller Geldenhuys (born 1943), Rhodesian-born South African pilot and author Quintin Geldenhuys (born 1981), South Africa-born Italian rugby union player Ross Geldenhuys (born 1983), South African rugby union footballer