| Tian Viljoen | |
| Fullname: | Christian "Tian" Viljoen |
| Birth Date: | 1961 4, df=y |
| Birth Place: | Pretoria, South Africa |
| Plays: | Right-handed |
| Singlestitles: | 0 |
| Highestsinglesranking: | No. 282 (4 January 1982) |
| Wimbledonresult: | 2R (1983) |
| Doublestitles: | 0 |
| Highestdoublesranking: | No. 49 (3 January 1983) |
| Frenchopendoublesresult: | 3R (1983) |
| Wimbledondoublesresult: | 3R (1983) |
| Usopendoublesresult: | 3R (1983) |
Christian "Tian" Viljoen (born 10 April 1961) is a former professional tennis player from South Africa. He enjoyed most of his tennis success while playing doubles. During his career, he finished runner-up in doubles at three events. He achieved a career-high doubles ranking of world No. 49 in January 1983.
| Result | W-L | Date | Tournament | Surface | Partner | Opponents | Score | |
|---|---|---|---|---|---|---|---|---|
| Loss | 0–1 | May 1982 | Munich, West Germany | Clay | Danie Visser |  Chip Hooper Mel Purcell | 4–6, 6–7 | |
| Loss | 0–2 | Feb 1983 | La Quinta, U.S. | Hard | Danie Visser | Brian Gottfried  Raúl Ramírez | 3–6, 3–6 | |
| Loss | 0–3 | Sep 1983 | Palermo, Italy | Clay | Danie Visser |  Pablo Arraya  José Luis Clerc | 6–1, 4–6, 4–6 |