Lourens Muller
Minister of Transport
In office 29 April 1974 – February 1979
Prime Minister	John Vorster P. W. Botha
Preceded by	Ben Schoeman
Succeeded by	Chris Heunis
Minister of Economic Affairs
In office 22 April 1970 – 29 April 1974
Prime Minister	John Vorster
Preceded by	Jan Haak
Succeeded by	Owen Horwood
Minister of Home Affairs
In office 9 August 1968 – 22 April 1970
Prime Minister	John Vorster
Preceded by	P. K. Le Roux
Succeeded by	Marais Viljoen
Minister of Police
In office 9 August 1968 – 29 April 1974
Prime Minister	John Vorster
Preceded by	John Vorster
Succeeded by	Jimmy Kruger as Minister of Justice, Police and Prisons
Personal details
Born	Stefanus Lourens Muller (1917-09-27)27 September 1917 Beaufort West, Cape Province, South Africa
Died	30 April 2005(2005-04-30) (aged 87) Somerset West, Western Cape South Africa
Resting place	Robertson
Political party	National Party (1961–1980)
Other political affiliations	Conservative Party (from 1982)
Spouse	Hanlie van Niekerk ​ (divorced)​
Occupation	Politician, lawyer, railwayman

Stefanus Lourens Muller (1917–2005) was a South African politician and cabinet minister.

Lourens Muller was born in Beaufort West in the Cape Province in 1917. Muller worked for South African Railways before studying law and practicing as a lawyer in Robertson. He was married to the soprano singer Hanlie van Niekerk, but divorced soon afterwards. In 1961, he was elected to parliament as the National Party candidate in the constituency of Ceres. Muller initially worked under the Justice ministry, then held several ministerial posts under prime minister John Vorster with whom he had developed a close political alliance. Under the Voster and Botha governments, Muller held the ministries of Police, Economic Affairs, Home Affairs and Transport.

After Vorster's resignation as State President in the aftermath of the information scandal, Muller was widely considered the favourite to succeed him.^[1] The position instead went to Marais Viljoen.

Muller was dismissed from the government by prime minister P. W. Botha, after a growing series of disagreements. After his dismissal, Muller left the National Party in 1980 and later became a founding member of Andries Treurnicht's Conservative Party. In 1981, Muller would retire from parliament at that year's general election. He died after a period of illness in 2005. He had been treated at a clinic in Somerset West before his death.