Nicolaas Johannes Diederichs

Nicolaas Diederichs (1903–1978) served as the third State President of South Africa from 1975 to 1978.

An economist, Diederichs obtained a doctorate from the University of Leiden. During the 1930s and 1940s he became a prominent figure in Afrikaner nationalist circles. He founded the Reddingsdaadbond organisation to promote the economic wellbeing of Afrikaners.

Diederichs was a National Party member of Parliament from 1953 to 1975. He served as Minister of Economic Affairs from 1958 to 1967, as Minister of Mines from 1961 to 1964, and as Minister of Finance from 1967 to 1975. In the latter capacity he became known as "Mr Gold." He served as the first chancellor or the Rand Afrikaans University and ceremonial State President from 1975 until his death, after a short illness, of a heart attack on 21 August 1978 in Cape Town.

Preceded by Jacobus Johannes Fouché	State President of South Africa 1975–1978	Succeeded by Marais Viljoen
Preceded by Theophilus Donges	Finance ministers of South Africa 1967–1975	Succeeded by Owen Horwood