- For others with this name, see John Riddle (disambiguation)
John Wallace Riddle (1864 – 1941) was an American diplomat. His first diplomatic assignment was as agent/consul general in Egypt (1904–1905). He was then sent to Romania and Serbia in 1905 to serve as Envoy Extraordinary and Minister Plenipotentiary (residing in Bucharest), followed by postings as U.S. ambassador to Russia (1907–1909) and ambassador to Argentina (1922–1925). He was married to American architect Theodate Pope Riddle.