The International Democrat Union includes as members the Republican Party in the USA, the Conservative Party in the UK, the Liberal Democratic Party in Japan and the Christian Democratic Union in Germany. The European parties are also joined in the EDU, i.e. European Democrat Union, and in the European Parliament (the parliament of the European Union) they are gathered in the party European People's Party - European Democrats (abbreviated EPP-ED).
The International Democrat Union is an international group of moderate right-wing conservative Christian-democrats party members. The flag is prominently displayed in their website. It is white with a red logo in it, slightly off to the fly. The logo consists of the initials "IDU" in block sans-serif capitals, superimposed at top and bottom with two narrow white stripes. These are colinear with the tropics of a stylized globe, which shows only those, the Equator and five hemi-meridians, partly visible behind the "I".
"The International Democrat Union (IDU) is a working association of over 80 Conservative, Christian Democrat and like-minded political parties of the centre and centre right.
- The International Democrat Union (IDU) shall consist of Member Parties of the Americas Democrat Union (ADU); the Asia Pacific Democrat Union (APDU); the Caribbean Democrat Union (CDU); the Democrat Union of Africa/African Dialogue Group (DUA/ADG); and the European Democrat Union, which have adhered to the IDU Declaration of Principles.
- The IDU will foster the common philosophy of its Member Parties, establish permanent relations at a bilateral and multilateral level, encourage mutual support and to these ends will provide a forum for the exchange of views and information on matters of interest to all or a considerable number of its Member Parties."
The current chairman of IDU is John Howard (Liberal Party, Australia).
A photograph of the flag of IDU is shown on the website of a local section of the French party UMP,The flag is white with the IDU emblem; however, on the flag, the white disk bordered in red forming the background of the emblem is omitted.