| Honorific-Prefix: | The Honourable |
| Theo van Wyk | |
| Honorific-Suffix: | KC |
| Office2: | Judge of the Cape Provincial Division of the Supreme Court |
| Term Start2: | 1967 |
| Term End2: | 1973 |
| Term Start3: | 1955 |
| Term End3: | 1961 |
| Office1: | Judge of the Appellate Division |
| Term Start1: | 1961 |
| Term End1: | 1967 |
| Office: | Judge President of the Cape Provincial Division |
| Term Start: | 1973 |
| Term End: | 1975 |
| Predecessor: | Andrew Beyers |
| Successor: | Helm van Zijl |
| Birthname: | Jacques Theodore van Wyk |
| Birth Date: | 15 June 1913 |
| Birth Place: | Vanrhynsdorp, Union of South Africa |
| Death Place: | Bellville, Western Cape, South Africa |
| Alma Mater: | University of Cape Town |
| Profession: | Advocate |
Jacques Theodore van Wyk KC (15 June 1913 – 17 November 1975) was a South African judge and Judge President of the Cape Provincial Division of the Supreme Court from 1973 until 1975.[1]
Van Wyk was born in Vanrhynsdorp in the Western Cape and after completing his schooling at Vanrhynsdorp, he went on to the University of Cape Town. He obtained the degrees of B.A. in 1934 and LL.B. in 1935. As a student he was involved with NUSAS and during the last two years of his studies, was a member of the student parliament.
In 1936, van Wyk was appointed registrar to Justice H. S. van Zyl and the following year was admitted to the Cape Bar. In 1949, at the age of thirty-six, he became the youngest KC in the Union of South Africa. In 1955, van Wyk was appointed a judge in the Cape Provincial Division of the Supreme Court and in 1961, he was promoted to Judge of Appeal. Van Wyk, however resigned as Judge of Appeal in 1967 and rejoined the Cape Division of the Supreme Court.[2] In 1973 he was appointed Judge President of the Cape, a post he had held until his death in 1975.
Van Wyk acted for the state in the constitutional crisis arising from the removal of the Coloureds from the common voters' roll during the fifties. Between 1962 and 1966 he was an ad hoc judge at the hearings of the International Court of Justice in The Hague on the South-West Africa issue.[3]
In 1968 the University of Cape Town awarded him the LL.D. degree (honoris causa) for his services.[4]