Grant Muller (born 16 July 1970) is a South African professional golfer who plays on the Sunshine Tour.

He turned professional in 1991 and joined the Sunshine Tour the same year.

He has won twice on the Sunshine Tour, with the first win coming in 1997 at the Vodacom Series: Kwazulu-Natal and the second in 2010 at the Lombard Insurance Classic.

Sunshine Tour playoff record (1–1) Note: Muller only played in The Open Championship.

This biographical article relating to golf in South Africa is a stub.