| Zainal Abidin III Malay: {{Script|Arab|زين العابدين ٣ | |
| Sultan of Terengganu | |
| Succession: | Sultan of Terengganu |
| Reign: | 1881–1918 |
| Coronation: | 1881 |
| Predecessor: | Sultan Ahmad Muadzam Shah II |
| Successor: | Sultan Muhammad Shah II |
| Issue: | Sultan Muhammad Shah II Sultan Sulaiman Badrul Alam Shah Sultan Ismail Nasiruddin Shah |
| Father: | Sultan Ahmad Muadzam Shah II |
| Mother: | Tengku Kulsum binti Sultan Muhammad Muadzam Shah |
| Birth Date: | 12 April 1866 |
| Birth Place: | Kuala Terengganu, Terengganu Town, |
| Death Place: | Kuala Terengganu, Terengganu, Malaysia |
| Religion: | Sunni Islam |
Sultan Zainal Abidin III Muadzam Shah ibni Almarhum Sultan Ahmad Muadzam Shah II,, (Jawi: Malay: سلطان زين العابدين ٣ معظم شاه ابن المرحوم سلطان أحمد معظم شاه ٢; 12 April 1866 – 26 November 1918) was sultan and Yang di-Pertuan Besar of the state of Terengganu from 1881 to 1918. He Succeeded his father, Sultan Ahmad on his death. During his reign Terengganu became a British protectorate via the Anglo-Siamese Treaty of 1909. In 1911, Sultan Zainal Abidin III issued Terengganu's first constitution. He died in Kuala Terengganu on 26 November 1918, aged 52, after a nearly 37-year reign and was buried in the Zainal Abidin mosque. He was succeeded by his son, Muhammad Shah II.
He edited the law of Terengganu, which is known as the Itqan al-muluk bi ta'dil al-suluk. He also rearranged the measurement and weighing system. This helped out in their trading as it proved the fairness of the process of trading. He also established Syariah High Court (Mahkamah Syariah) and the police of Terengganu. He also built the Istana Maziah which is the official palace of Terengganu.[1]
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