The yang di-pertuan agong (lit. 'He Who is Made Lord' in Malaysian, Jawi: يڠدڤرتوان اݢوڠ‎), also known as the supreme head, supreme head of the Federation, Paramount ruler or king, is the constitutional monarch and head of state of Malaysia. The office was established in 1957, when the Federation of Malaya (now Malaysia) gained independence from the United Kingdom. The Yang di-Pertuan Agong is elected by the Conference of Rulers, comprising the nine rulers of the Malay states, with the office de facto rotated between them, making Malaysia one of the world's few elective monarchies.

The 16th and current Yang di-Pertuan Agong is Sultan Abdullah of Pahang, replacing Muhammad V of Kelantan, who abdicated on 6 January 2019. Abdullah was elected on 24 January, at a special meeting of the Conference of Rulers; he took the oath of office and was sworn in at the Istana Negara on 31 January.

The Yang di-Pertuan Agong's queen consort is known as the Raja Permaisuri Agong, currently Tunku Azizah Aminah Maimunah Iskandariah. The royal couple are styled in English as "His Majesty" and "Her Majesty".