Principal Officers and Chiefs of Mission, by year: 1915
Note: Career Foreign Service appointees are asterisked.
- Willard, Joseph Edward (1865-1924)
- Envoy Extraordinary and Minister Plenipotentiary, Spain (1913)
- Ambassador Extraordinary and Plenipotentiary, Spain (1913-1921)
- Adee, Alvey Augustus (1842-1924)
- Third Assistant Secretary of State (1882-1886)
- Second Assistant Secretary of State (1886-1924)
- Secretary of State ad interim (1898)
- Assistant Secretary of State (1924)
- Arnold, Olney (1861-1916)
- Agent/Consul General, Egypt (1913-1916)
- *Bailly-Blanchard, Arthur (1855-1925)
- Envoy Extraordinary and Minister Plenipotentiary, Haiti (1914-1921)
- Birch, Thomas Howard (1875-1929)
- Envoy Extraordinary and Minister Plenipotentiary, Portugal (1913-1922)
- Bryan, William Jennings (1860-1925)
- Secretary of State (1913-1915)
- Buckner, George Washington (1855-?)
- Minister Resident/Consul General, Liberia (1913-1915)
- Curtis, James L. (1870-1917)
- Minister Resident/Consul General, Liberia (1915-1917)
- *Dillery, Carl Edward (1930-)
- Ambassador Extraordinary and Plenipotentiary, Kiribati (1884-1987)
- Ambassador Extraordinary and Plenipotentiary, Fiji (1984-1987)
- Ambassador Extraordinary and Plenipotentiary, Tonga (1984-1987)
- Ambassador Extraordinary and Plenipotentiary, Tuvalu (1984-1987)
- Egan, Maurice Francis (1852-1924)
- Envoy Extraordinary and Minister Plenipotentiary, Denmark (1907-1917)
- Ewing, John (1857-1923)
- Envoy Extraordinary and Minister Plenipotentiary, Honduras (1913-1918)
- Droppers, Garrett (1860-1927)
- Envoy Extraordinary and Minister Plenipotentiary, Montenegro (1914)
- Envoy Extraordinary and Minister Plenipotentiary, Greece (1914-1920)
- *Fletcher, Henry Prather (1873-1959)
- Envoy Extraordinary and Minister Plenipotentiary, Chile (1909-1910)
- Ambassador Extraordinary and Plenipotentiary, Chile (1914-1916)
- Ambassador Extraordinary and Plenipotentiary, Mexico (1916-1919)
- Under Secretary of State (1921-1922)
- Ambassador Extraordinary and Plenipotentiary, Belgium (1922-1924)
- Envoy Extraordinary and Minister Plenipotentiary, Luxembourg (1923-1924)
- Ambassador Extraordinary and Plenipotentiary, Italy (1924-1929)
- Guthrie, George Wilkins (1848-1917)
- Ambassador Extraordinary and Plenipotentiary, Japan (1913-1917)
- Hartman, Charles Sampson (1861-1929)
- Envoy Extraordinary and Minister Plenipotentiary, Ecuador (1913-1922)
- Gonzales, William Elliott (1866-1937)
- Envoy Extraordinary and Minister Plenipotentiary, Cuba (1913-1919)
- Ambassador Extraordinary and Plenipotentiary, Peru (1919-1921)
- Hornibrook, William Harrison (1884-1946)
- Envoy Extraordinary and Minister Plenipotentiary, Thailand (1915-1916)
- Envoy Extraordinary and Minister Plenipotentiary, Iran (1933-1936)
- Envoy Extraordinary and Minister Plenipotentiary, Afghanistan (1935-1936)
- Envoy Extraordinary and Minister Plenipotentiary, Costa Rica (1937-1941)
- Jefferson, Benjamin Lafayette (1871-1950)
- Envoy Extraordinary and Minister Plenipotentiary, Nicaragua (1913-1921)
- Jeffery, Robert Emmett (1875-1935)
- Envoy Extraordinary and Minister Plenipotentiary, Uruguay (1915-1921)
- Marye, George T. (1857-1933)
- Ambassador Extraordinary and Plenipotentiary, Russia (1914-1916)
- McGoodwin, Preston Buford (1880-1945)
- Envoy Extraordinary and Minister Plenipotentiary, Venezuela (1913-1921)
- McMillin, Benton (1845-1933)
- Envoy Extraordinary and Minister Plenipotentiary, Peru (1913-1919)
- Envoy Extraordinary and Minister Plenipotentiary, Guatemala (1919-1920)
- Lansing, Robert (1864-1928)
- Counselor (1914-1915)
- Secretary of State ad interim (1915)
- Secretary of State (1915-1920)
- Leavell, William Hayne (1850-1930)
- Envoy Extraordinary and Minister Plenipotentiary, Guatemala (1913-1918)
- Long, Boaz Walton (1876-1962)
- Envoy Extraordinary and Minister Plenipotentiary, El Salvador (1914-1917)
- Envoy Extraordinary and Minister Plenipotentiary, Cuba (1919-1921)
- Envoy Extraordinary and Minister Plenipotentiary, Nicaragua (1936-1938)
- Envoy Extraordinary and Minister Plenipotentiary, Ecuador (1938)
- Ambassador Extraordinary and Plenipotentiary, Ecuador (1942-1943)
- Ambassador Extraordinary and Plenipotentiary, Guatemala (1943-1945)
- Mooney, Daniel Francis (1865-1930)
- Envoy Extraordinary and Minister Plenipotentiary, Paraguay (1914-1921)
- *Morgan, Edwin Vernon (1865-1934)
- Envoy Extraordinary and Minister Plenipotentiary, Korea (1905)
- Envoy Extraordinary and Minister Plenipotentiary, Cuba (1905-1910)
- Envoy Extraordinary and Minister Plenipotentiary, Paraguay (1909-1911)
- Envoy Extraordinary and Minister Plenipotentiary, Uruguay (1909-1911)
- Envoy Extraordinary and Minister Plenipotentiary, Portugal (1911-1912)
- Ambassador Extraordinary and Plenipotentiary, Brazil (1912-1933)
- Morgenthau, Henry (1856-1946)
- Ambassador Extraordinary and Plenipotentiary, Turkey (1913-1916)
- Ambassador Extraordinary and Plenipotentiary, Mexico (Not commissioned; nomination not confirmed by the Senate.)
- Morris, Ira Nelson (1875-1942)
- Envoy Extraordinary and Minister Plenipotentiary, Sweden (1914-1923)
- O'Rear, John Davis (1868-1918)
- Envoy Extraordinary and Minister Plenipotentiary, Bolivia (1913-1918)
- Osborne, John Eugene (1858-1943)
- Assistant Secretary of State (1913-1916)
- Page, Thomas Nelson (1853-1922)
- Ambassador Extraordinary and Plenipotentiary, Italy (1913-1919)
- Page, Walter Hines (1855-1918)
- Ambassador Extraordinary and Plenipotentiary, United Kingdom (1913-1918)
- Penfield, Frederic Courtland (1855-1922)
- Agent/Consul General, Egypt (1893-1897)
- Ambassador Extraordinary and Plenipotentiary, Austria (1913-1917)
- *Phillips, William (1878-1968)
- Envoy Extraordinary and Minister Plenipotentiary, Luxembourg (1920-1922)
- Envoy Extraordinary and Minister Plenipotentiary, Netherlands (1920-1922)
- Ambassador Extraordinary and Plenipotentiary, Belgium (1924-1927)
- Envoy Extraordinary and Minister Plenipotentiary, Luxembourg (1924-1927)
- Envoy Extraordinary and Minister Plenipotentiary, Canada (1927-1929)
- Ambassador Extraordinary and Plenipotentiary, Italy (1936-1941)
- Third Assistant Secretary of State (1909)
- Third Assistant Secretary of State (1914-1917)
- Under Secretary of State (1922-1924)
- Under Secretary of State (1933-1936)
- Polk, Frank Lyon (1871-1943)
- Counselor (1915-1919)
- Under Secretary of State (1919-1920)
- Secretary of State ad interim (1920)
- Price, William Jennings (1873-1952)
- Envoy Extraordinary and Minister Plenipotentiary, Panama (1913-1921)
- Reinsch, Paul Samuel (1869-1923)
- Envoy Extraordinary and Minister Plenipotentiary, China (1913-1919)
- Russell, William Worthington (1859-1944)
- Envoy Extraordinary and Minister Plenipotentiary, Colombia (1904-1905)
- Envoy Extraordinary and Minister Plenipotentiary, Venezuela (1905)
- Minister Resident/Consul General, Dominican Republic (1910)
- Envoy Extraordinary and Minister Plenipotentiary, Dominican Republic (1911-1913)
- Envoy Extraordinary and Minister Plenipotentiary, Dominican Republic (1915-1925)
- Envoy Extraordinary and Minister Plenipotentiary, Thailand (1925-1927)
- Schmedemann, Albert George (1864-1946)
- Envoy Extraordinary and Minister Plenipotentiary, Norway (1913-1921)
- Sharp, William Graves (1859-1922)
- Ambassador Extraordinary and Plenipotentiary, France (1914-1919)
- Stimson, Frederic Jesup (1855-1943)
- Ambassador Extraordinary and Plenipotentiary, Argentina (1914-1921)
- Stovall, Pleasant Alexander (1857-1935)
- Envoy Extraordinary and Minister Plenipotentiary, Switzerland (1913-1919)
- Sullivan, James Mark (1873-1935)
- Envoy Extraordinary and Minister Plenipotentiary, Dominican Republic (1913-1915)
- van Dyke, Henry (1852-1933)
- Envoy Extraordinary and Minister Plenipotentiary, Luxembourg (1913-1917)
- Envoy Extraordinary and Minister Plenipotentiary, Netherlands (1913-1917)
- Vopicka, Charles Joseph (1857-1935)
- Envoy Extraordinary and Minister Plenipotentiary, Bulgaria (1913)
- Envoy Extraordinary and Minister Plenipotentiary, Romania (1913-1920)
- Envoy Extraordinary and Minister Plenipotentiary, Yugoslavia (1913)
- Thomson, Thaddeus Austin (1853-1927)
- Envoy Extraordinary and Minister Plenipotentiary, Colombia (1913-1916)