Lieutenant General Ivan Lemmer SM (born 11 January 1931)[1] was a former South African Army officer, who served as Chief of Staff Logistics.

Lemmer joined the Permanent Force in 1950 and subsequently served as a transport and training officer at 16 Field Squadron and the School of Military Engineering (Kroonstad), respectively.

[1] In 1964 he was appointed as Officer Commanding 1 Composite Construction Regiment and later Director Engineers at Army Headquarters.

He was the Acting Chief of Staff Intelligence during 1977 and in 1978 he was promoted to the rank of Lieutenant General and appointed on July 1 as Deputy-Chief of Staff Logistics.

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