Johannes Hendricus Marais (born 28 May 1959 in Pretoria, South Africa) is a former South African rugby union player.
Marais represented the Northern Transvaal Schools team at the 1975 and the 1976 annual Craven Week tournament.
After matriculating at Hoërskool Menlopark, Marais enrolled at the University of Pretoria in 1977.
He played and captained the Northern Transvaal under–20 team and made his senior provincial debut for Northern Transvaal in 1980.
At the end of the 1980 rugby season, Marais was nominated as one of the five South African young players of the year.