Paduka Sri Tuanku Sultan Al-Haj Sir Zainal Abidin III Muazzam Shah ibn al-Marhum Sultan Ahmad,KCMG, (12 April 1866-26 November 1918) was Sultan and Yang di-Pertuan Besar of the state of Terengganu from 1881 to 1918. Succeeding on the death of his father Sultan Ahmad, under his reign Terengganu became a British protectorate by the Anglo-Siamese Treaty of 1909. In 1911, Sultan Zainal Abidin III issued Terengganu's first constitution. He died in 1918, aged 52, after a nearly 37 year reign. He was succeeded by his son, Muhammad Shah II.