Paul Hymans (1920–21) · Herman Adriaan van Karnebeek (1921–22) · Agustín Edwards (1922–23) · Cosme de la Torriente y Peraza (1923–24) · Giuseppe Motta (1924–25) · Raoul Dandurand (1925–26) · Afonso Costa (1926) · Momčilo Ninčić (1926–27) · Alberto Guani (1927–28) · Herluf Zahle (1928–29) · José Gustavo Guerrero (1929–30) · Nicolae Titulescu (1930–32) · Paul Hymans (1932–33) · Charles Theodore Te Water (1933–34) · Richard Johannes Sandler (1934) · Francisco Castillo Nájera (1934–35) · Edvard Beneš (1935–36) · Carlos Saavedra Lamas (1936–37) · Tevfik Rüştü Aras (1937) · Aga Khan III (1937–38) · Éamon de Valera (1938–39) · Carl Joachim Hambro (1939–40, 1946)