Abu Sufian bin Haji Ali (born 23 March 1966) is a Brunei diplomat who became the ambassador to Belgium from 2017 to 2021,[1] and the permanent representative to the United Nations (UN) in Geneva.

[4] His involvement in international negotiations includes being a member of the Brunei delegation for the Brunei-Japan Economic Partnership Agreement (BJEPA) from 2006 to 2008.

[4] Not long after being presented his letter of credential on 29 November 2012, Abu Sufian was approved by Prince Al-Muhtadee Billah for a meeting with him at Qashr Al-Meezaan on 8 December.

[6] Concurrently, he held the important positions of permanent representative to the Comprehensive Nuclear-Test-Ban Treaty (CTB) and International Atomic Energy Agency (IAEA) in Vienna.

[8][9][10] After being appointed as the new ambassador to Belgium, Abu Sufian received his new letter of credential from Sultan Hassanal Bolkiah at Istana Nurul Iman on 13 August 2016.

[11] At this capacity, he would hold accredations to Benelux countries, the European Union (EU), the Organisation for the Prohibition of Chemical Weapons (OPCW), Hungary, Sweden, and Denmark.