The Illustrious Order of Loyalty to Sultan 'Abdu'l Halim Mu'azzam Shah (Bahasa Melayu: Darjah Yang Mulia Sri Setia Sultan 'Abdu'l Halim Mu'azzam Shah) is an honorific order of the Sultanate of Kedah.

It was founded by Sultan Abdul Halim of Kedah on 15 July 1983 in three classes.

A further and upper class was added in 2008 : Grand Commander or Darjah Seri Setia Sultan 'Abdu'l Halim Mu'azzam Shah – SHMS.

It is awarded in four classes: Sultan Abdul Halim of Kedah:[3] Members of the Royal Family of Kedah: