Major-General Sir Reginald Walter Ralph Barnes KCB DSO DL JP (13 April 1871 – 19 December 1946) was a cavalry officer in the British Army. He served in several regiments, and commanded a battalion of the Imperial Yeomanry, the 10th (Prince of Wales's Own) Royal Hussars, the 111th Brigade, and three divisions.
During his career he served in the Cuban War of Independence, the Second Boer War and the First World War. Becoming a Companion of the Distinguished Service Order, and a Knight Commander of The Most Honourable Order of the Bath. He was also awarded a French Croix de Guerre.