Norman Reginald McMahon (24 January 1866 – 11 November 1914) was a British Army officer. He served with the Royal Fusiliers in the Burma expedition of 1886–87 and in the Second Boer War of 1899–1902. During the latter campaign he served on the general staff as an aide-de-camp and then brigade major. McMahon was seriously wounded in action and was subsequently mentioned in dispatches and awarded the Distinguished Service Order. Once recovered he served as Deputy Assistant Adjutant General towards the end of the war.