Mohamed Dzaiddin bin Abdullah (16 September 1938 – 11 July 2024) was a Malaysian judge, lawyer, police officer and reporter who served as the 3rd Chief Justice of Malaysia from December 2000 to March 2003.
From 1956 to September 1957, he worked as a reporter for The Malay Mail before joining the Royal Malayan Police Force as an inspector with the Special Branch.
In January 1967, Mohamed Dzaiddin was admitted as an advocate and solicitor of the High Court of Malaya and served in Kota Bharu, Kelantan and Kuala Lumpur till October 1982.
In June 2000, Mohamed Dzaiddin was bestowed the Grade of Panglima Setia Mahkota (PSM) by the Yang di-Pertuan Agong, which carries the title "Tan Sri".
Later in June 2002, he was bestowed the Grade of Seri Setia Mahkota (SSM) by the Yang DiPertuan Agong, which carries the title "Tun".