Kenneth George Viljoen (14 May 1910 – 21 January 1974) was a South African cricketer who played in 27 Test matches from 1930–31 to 1948–49. Making his Test debut in 1930, he played his first and last Tests against England. He was later a manager of post–World War II South African teams. He was born in Windsorton, Cape Province, and died in Krugersdorp, Transvaal.