Leland Burnette Morris (1886-1950) was an American diplomat. He was the first United States Ambassador to Iran, serving that post from 1944 to 1945. Earlier he was the United States Ambassador to Iceland. Morris served many other diplomatic posts including American Consul General in Jerusalem in 1936, American Consul General in Vienna from 1938 to 1940 after the German annexation of Austria and the American Chargé d'Affaires in Germany during the outbreak of official American involvement in World War II.
Morris was born in Fort Clark, Texas. His father was Louis Thompson Morris, a colonel in the United States Army, and his mother was Susan Frances (née Reece) Morris.
Morris became the American Chargé d'Affaires in Germany in October 1940. Prior to the Japanese attack on Pearl Harbor on December 7, 1941, the United States was officially neutral and retained a diplomatic corps in Berlin. This included diplomat George Kennan. Morris, serving as Chargé d'Affaires, was the highest ranking American diplomat in Germany at the time (the last United States Ambassador, Hugh R. Wilson, was recalled in 1938 in protest of Kristallnacht). After the Pearl Harbor attack, on December 11 German Foreign Minister Joachim von Ribbentrop summoned Morris to his office and read to Morris Germany's formal declaration of war and addressed him by accusing the United States of violations of neutrality and other acts of war. Upon handing Morris the declaration document, Ribbentrop said, "Your President has wanted this war, now he has it." Official diplomatic relations between the United States and Germany ended.