The International Young Democrat Union is an international grouping of conservative, classical liberal and Christian democratic youth organisations. It is headquartered in London.

Formed in 1992, the IYDU is the world’s leading international political youth organisation comprising 80 organisations from 50 countries. The IYDU links centre right political youth organisations internationally.

The IYDU is the youth wing of the International Democrat Union

Chairmen of the IYDU have been:

Among other activities the organisation runs a "Freedom Campaign" dedicated to supporting pro-democracy groups in nations with totalitarian governments. Nations targetted by this campaign include.