General Sir Arthur Singleton Wynne, GCB, DL (5 March 1846 – 6 February 1936), was a senior British Army officer from the Anglo-Irish gentry who served as Military Secretary.

[1] In 1885 he was awarded the Order of the Medjidie, 3rd Class, by the Khedive of Egypt for "service in Sudan",[3] and by 1889 he was Deputy Assistant-Adjutant-General at Army Headquarters.

[1] Wynne served in the Second Boer War and was appointed Deputy Adjutant-General for the Natal Field Force in South Africa,[6][1] and after the Battle of Spion Kop he was given command of the 11th Infantry Brigade in place of General Sir Edward Woodgate, who died from wounds sustained in action;[7][8] During the Battle of the Tugela Heights in February 1900 Wynne was slightly injured,[9] and his command was given to Colonel Walter Kitchener.

[11] After recovering, he was appointed in command of the Cape Colony District until his return to Great Britain in early 1902.

[18] In retirement Wynne was promoted General and appointed Keeper of the Jewel House, holding the office from 1911 to 1917.