|Birth name||Helgard Lourens Müller|
|Date of birth||June 1, 1963|
|Place of birth||South Africa Bloemfontein, South Africa|
|Height||1.82 m (6 ft 0 in)|
|Weight||78 kg (12 st 4 lb)|
|School||Grey College, Bloemfontein|
|Notable relative(s)||Pieter Muller (brother)|
|Rugby union career|
In 1981, Müller was chosen for the South African School Team. Müller appeared as a replacement for the Springboks against the New Zealand Cavaliers in 1986, and against the World Invitation Team in 1989. He also played three tour matches, and therefore appeared five times in the green-and-gold. When the Free State played in the 1997 Super 12, Müller was captain. Müller's Springbok appearances were limited by the strong competition at centre at the time, including Danie Gerber, Michael du Plessis and Faffa Knoetze.
Müller appeared 142 times for the Free State in Currie Cup rugby, and 245 times in total, including at junior level, tour matches, the Vodacom Cup and Super Rugby.
|No.||Opposition||Result (SA 1st)||Position||Tries||Date||Venue|
|1.||New Zealand Cavaliers||24–10||Replacement||31 May 1986||Ellis Park, Johannesburg|
|2.||World XV||20–19||Replacement||26 Aug 1989||Newlands, Cape Town|
In 1984, Müller was nominated as Young Player of the Year, together with Paul Botes, Niel Burger, Wessel Lightfoot and Uli Schmidt.
- List of South Africa national rugby union players – Springbok no. 551
- "Helgard Muller - 'n eerbetoon". rugby-talk.com. 30 January 2013. Retrieved 28 February 2013.