Oliver Reginald Tambo (27 October 1917 - 24 April, 1993) was a South African ANC politician. He was born in Mbizana in eastern Mpondoland in what is now Eastern Cape.
In 1955 he became Secretary General of the ANC after Walter Sisulu was banned by the South African government under the Suppression of Communism Act. In 1958 he became Deputy President of the ANC and in 1959 was served with a five year banning order by the government.
In 1960 the ANC sent him abroad in order to mobilise opposition to apartheid. He was involved in the formation of the South African United Front which achieved the expulsion of South Africa from the Commonwealth in 1961.