Al-Sultan Abdullah Ri'ayatuddin Al-Mustafa Billah Shah ibni Almarhum Sultan Haji Ahmad Shah Al-Musta'in Billah is the Sultan of Pahang since the abdication of his father in 2019. He was the sixteenth Yang di-Pertuan Agong (King) of Malaysia, from 2019 to 2024, being sworn in just a few weeks after ascending to the throne as Sultan of Pahang.

Sultan of Pahang is the title of the hereditary constitutional head of Pahang, Malaysia. The current sultan is Al-Sultan Abdullah ibni Sultan Ahmad Shah. He is the Head of Islam in the state and the source of all titles, honours and dignities in the state. Historically, the title was also used by rulers of the Old Pahang Sultanate.