The Sultan of Kelantan is the constitutional head of Kelantan state in Malaysia. The executive power of the state is vested in him as the monarch of the state. The current sultan, Muhammad V, is the 29th Sultan of Kelantan. He is the Head of Islam in the state and the source of all titles, honours and dignities of its people. He was the 15th Yang di-Pertuan Agong or the monarch and head of state of Malaysia from 13 December 2016 to his abdication on 6 January 2019, after his election on 14 October 2016 at the 243rd (special) Conference of Rulers.

Sultanah Nur Diana Petra Abdullah is a Czech-born who is the current Sultanah of Kelantan and a member of the Kelantan royal family as the wife of Sultan Muhammad V, the current Sultan of Kelantan.