Category:20th century in international relations

• 1900s in international relations‎ (10 C)
• 1910s in international relations‎ (10 C)
• 1920s in international relations‎ (10 C)
• 1930s in international relations‎ (10 C)
• 1940s in international relations‎ (11 C)
• 1950s in international relations‎ (11 C, 1 P)
• 1960s in international relations‎ (11 C, 1 P)
• 1970s in international relations‎ (11 C, 1 P)
• 1980s in international relations‎ (11 C)
• 1990s in international relations‎ (11 C, 2 P)

B

• Baltic diplomatic missions‎ (18 P)

C

• Cold War‎ (23 C, 179 P)
• 20th-century conflicts‎ (55 C, 84 P)
• Foreign relations of Czechoslovakia‎ (11 C, 12 P)

D

• 20th-century diplomatic conferences‎ (6 C, 222 P)
• 20th-century diplomats‎ (8 C, 153 P)

G

• Foreign relations of East Germany‎ (9 C, 9 P)
• Foreign relations of West Germany‎ (2 C, 1 P)

I

• Foreign relations during the Iran–Iraq War‎ (2 C, 15 P)

L

• League of Nations‎ (7 C, 58 P)
• Lists of sovereign states in the 20th century‎ (10 P)

M

• 20th-century military alliances‎ (10 C, 72 P)

N

• Non-Aligned Movement‎ (4 C, 21 P)

R

• Foreign relations of Rhodesia‎ (8 C, 11 P)
• Foreign relations of the Russian Empire‎ (9 C, 8 P)

S

• Foreign relations of the Soviet Union‎ (36 C, 125 P)

T

• 20th-century treaties‎ (146 C, 2 P)

A

• List of international presidential trips made by António José de Almeida
• Appeasement

C

• Central Powers
• List of Commonwealth visits made by Elizabeth II
• CONEFO

D

• De-satellization of the Socialist Republic of Romania
• Diplomatic history of World War I
• Dissolution of the Ottoman Empire

E

• External association

F

• Foreign relations of the Axis powers

I

• Inter-Allied Rhineland High Commission
• List of international presidential trips made by George H. W. Bush
• List of international presidential trips made by Jimmy Carter
• List of international presidential trips made by Ronald Reagan
• International relations (1919–1939)
• List of international trips made by Mikhail Gorbachev

J

• Shimoda Conference

L

• Linkage (policy)
• List of international trips made by Josip Broz Tito
• List of international trips made by Yasser Arafat
• List of national border changes (1914–present)
• List of international presidential trips made by Francisco Craveiro Lopes

M

• List of international presidential trips made by Bernardino Machado

N

• List of national border changes from 1815 to 1914
• Non-Aligned Movement

O

• Ottoman Empire in World War I

P

• Pax Britannica
• Pax Syriana

R

• Reagan Doctrine
• Occupation of the Rhineland
• Foreign policy of the Russian Empire
• Russian entry into World War I

S

• Scramble for Africa
• List of international presidential trips made by Mário Soares
• List of state visits made by Elizabeth II

U

• United Nations trust territories

W

• Weak countries have no diplomacy