Roelof 'Joggie' Viljoen (born 22 July 1976)^[1] is a South African rugby union footballer who played at scrum-half for the South Africa national rugby union team during the late 1990s. Viljoen, a native of South Africa's Eastern Cape Province, currently resides in New Zealand.

As a schoolboy, Viljoen represented the Eastern Province at three consecutive Craven Week tournaments, from 1992 to 1994 and was selected for the South African Schools team in 1993 and 1994. He started his senior career in 1995 with Northern Transvaal, playing one game for the union. He then moved to Western Province, followed by Northland in New Zealand and back in South Africa with South Western Districts and finally the Falcons. He also played Super Rugby for the Stormers and the Hurricanes. In late 2006, Viljoen moved again to New Zealand where he was the first choice scrum-half for Manawatu in the NPC.^[2][3]

Viljoen toured Argentina and Europe with the Springboks at the end of the 1996 season. He did not play in any test matches but played in three tour matches for the Springboks.^[4]

• List of South Africa national rugby union players – Springbok no. 644