Donald Swain Lewis, DSO (5 April 1886 – 10 April 1916) was a Lieutenant Colonel in the British Army and was the second highest-ranked officer in the Royal Flying Corps/Royal Air Force to be killed in action in the First World War. His father was Ernest Lewis, one of the founding directors of the Army & Navy Stores (United Kingdom). On 15 September the British Third Corps assigned its RFC squadrons to support the divisional heavy & howitzer batteries. The radio-equipped aeroplanes successfully supported the artillery in taking out German positions during the offensive on the Aisne.