Major-General Malcolm Neynoe MacLeod MC (23 May 1882 – 1 August 1969) was Director General of the Ordnance Survey from 1935 to 1943.

In 1935, he started the retriangulation of Great Britain, an immense task which involved erecting concrete triangulation pillars (trig points) on prominent (often inaccessible) hilltops throughout Britain. As well as being an immense physical task, it was also an extremely complex mathematical undertaking. MacLeod can fairly be said to be the creator of the Ordnance Survey in its modern form.

MacLeod was commissioned in the Royal Engineers in 1900, serving in India from 1902 until 1914. During World War I he commanded the 4th Field Survey Battalion and was awarded the MC in the 1917 New Year Honours. He became Chief Instructor at the School of Artillery, Larkhill in 1920, serving until 1923 when he moved to the Ordnance Survey. After attending the Staff College, Quetta.^[1] he was Director-General of the Ordnance Survey in 1935, retiring in 1943.

• Yolande Hodson, 2004, 'MacLeod, Malcolm Neynoe (1882–1969)', Oxford Dictionary of National Biography. Oxford: Oxford University Press.
• Smart, Nick (2005). Biographical Dictionary of British Generals of the Second World War. Barnesley: Pen & Sword. ISBN 1844150496.

• Papers relating to Malcolm MacLeod
• Generals of World War II

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