Lieutenant-Colonel Lord William Walter Montagu Douglas Scott MC (17 January 1896 – 30 January 1958) was a Scottish aristocrat and politician. The 2nd son of John Montagu Douglas Scott, 7th Duke of Buccleuch, he was educated at Eton College and at the Royal Military College, Sandhurst. He was commissioned into the 10th Hussars. Promoted Lieutenant in 1915, he won the Military Cross in 1918 and was shortly afterwards promoted Captain. From 1925 to 1926 he was ADC to the Governor-General of Canada. He retired in 1927. He rejoined the Army in the Second World War, serving in Italy and reaching the rank of Lieutenant-Colonel.