Map showing the birth in 1955 of Western European Union (WEU), which succeeded Western Union (WU). As part of the Paris Agreements, the Protocol modifying and completing the 1948 Brussels Treaty was signed in the French capital on 23 October 1954 and came into force on 6 May 1955.

Map showing accessions to Western Union (WU) and Western European Union (WEU) and the status of the members.

List of Member States, Associate Members, Observers and Associate Partners of Western European Union (WEU).

List of the Presidencies of the Council of Western Union (WU) and the Council of Western European Union (WEU).

List of the Presidents of the Parliamentary Assembly of Western European Union (WEU) since 1955.

List of the Secretaries-General of Western Union (WU), since 1948, and of Western European Union (WEU), since 1955.