Sultan of Terengganu is the title of the constitutional head of Terengganu state in Malaysia. The current sultan, Mizan Zainal Abidin of Terengganu, is the 18th sultan and 13th Yang di-Pertuan Agong of Malaysia from 2006 to 2011. He is the head of the religion of Islam in the state and the source of all titles, honours and dignities in the state.

Terengganu, formerly spelled Trengganu or Tringganu, is a sultanate and federal state of Malaysia. The state is also known by its Arabic honorific, Dāru l-Īmān. The coastal city of Kuala Terengganu, which stands at the mouth of the broad Terengganu River, is both the state and royal capital as well as the most populous city in Terengganu. Other major cities and towns includes Jerteh, Kuala Dungun, Chukai, Kuala Berang, Marang, and Permaisuri. At 13,035 square kilometres in size and a population of over 1.2 million people in 2023, Terengganu is Malaysia's 7th largest state by area and 10th largest in population. Terengganu, along with Kelantan, Perlis and the Federal Territory of Putrajaya is one of the most homogeneous states/territories in the country of which 95% of the population are ethnic Malay-Muslims with its own distinct language/dialect, culture, history and tradition.