Sir Rudolph Edgar Francis de Trafford, 5th Baronet, OBE (31 August 1894 – 16 August 1983) was a British aristocrat and banker who succeeded his brother to the de Trafford baronetage at the age of 77. Rudolph was the second son of Sir Humphrey de Trafford, 3rd Baronet and Violet Alice Maud Franklin. He attended Downside (Sep 1907 to Jul 1911), and Trinity College, Cambridge, where he was friends with Marshall Field III. After graduating with a BA in 1915, he fought in the First World War, being twice mentioned in despatches. In 1919, Rudolph joined Marshall Field in California for a vacation with Field's wife and children on Catalina Island.