The Special Relationship is a phrase used to describe the exceptionally close political, diplomatic, cultural, economic, military and historical relations between the United Kingdom and the United States following its use in a 1946 speech by British statesman Winston Churchill. Although both the United Kingdom and United States have close relationships with many other nations, the level of cooperation between them in economic activity, trade and commerce, military planning, execution of military operations, nuclear weapons technology, and intelligence sharing has been described as "unparalleled" among major powers.

The term special relationship, in diplomacy, is used to describe exceptionally strong ties between nations, notably by Winston Churchill in 1946 to describe relations between the English-speaking people. An example of such a Special Relationships is the United Kingdom–United States relations. In its extended use outside the Anglosphere has also been used to describe the whole EU-US relations and the following relations:

• Albania–Kosovo relations
• Australia–New Zealand relations
• Azerbaijan–Turkey relations
• Belarus–Russia relations
• Brazil–Portugal relations
• Canada–United States relations
• China–Germany relations
• China–Pakistan relations
• China–Russia relations
• Egypt–Sudan relations
• Egypt–United Arab Emirates relations
• France–Monaco relations
• Holy See–Italy relations
• India–Russia relations
• India–Israel relations
• Italy–Russia relations 
• Israel–United States relations
• Laos–Vietnam relations
• Moldova–Romania relations
• Pakistan–United Arab Emirates relations
• Relations between the different parts of the British Empire and Commonwealth
  • Canada–United Kingdom relations
  • Egypt–United Kingdom relations
  • India–United Kingdom relations 
  • South Africa–United Kingdom relations
  • United Arab Emirates–United Kingdom relations
• Relations between member states of the European Union
  • Belgium–Netherlands relations
  • Cyprus–Greece relations
  • Finland–Sweden relations
  • France–Germany relations
  • France–Greece relations
  • France–Italy relations
  • Germany–Italy relations
  • Greece–Italy relations