The diplomatic corps (French: corps diplomatique) is the collective body of foreign diplomats accredited to a particular country or body.

The diplomatic corps may, in certain contexts, refer to the collection of accredited heads of mission (ambassadors, high commissioners, nuncios and others) who represent their countries in another state or country. As a body, they usually only assemble to attend state functions like a coronation, inauguration, national day or State Opening of Parliament, depending on local custom. They may also assemble in the royal or presidential palace to give their own head of state's New Year greeting to the head of state of the country in which they are based.

The term is sometimes confused with the collective body of diplomats from a particular country—the proper term for which is diplomatic service. The diplomatic corps is not always given any formal recognition by its host country, but can be referenced by official orders of precedence.

In many countries, and especially in Africa, the heads and the foreign members of the country offices of major international organizations (United Nations agencies, the European Union, the International Committee of the Red Cross, agencies of the African Union, etc.) are considered members—and granted the rights and privileges—of the diplomatic corps.

Diplomatic vehicles in most countries have distinctive diplomatic license plates, often with the prefix or suffix CD, the abbreviation for the French corps diplomatique.