Al-Wathiqu Billah Sultan Mizan Zainal Abidin ibni Almarhum Sultan Mahmud Al-Muktafi Billah Shah (Jawi: الواثق بالله سلطان ميزان زين العابدين ابن المرحوم سلطان محمود المکتفي بالله شاه; born 22 January 1962) is Sultan of Terengganu, reigning since 1998. He previously reigned as the thirteenth Yang di-Pertuan Agong, the constitutional monarch of Malaysia, from 2006 to 2011.