Abdul Mateen ibni Hassanal Bolkiah (Jawi: عبد المتين; born 10 August 1991) is a member of the royal family of Brunei. He is the tenth child and fourth son of Sultan Hassanal Bolkiah of Brunei, by his former second wife, Yang Mulia Datin Paduka Seri Puan Hajah Mariam binti Haji Abdul Aziz. Additionally, he is the founder of Jab Boxing Gym and the Deputy Chairman of the Jabatan Adat Istiadat Negara (JAIN).
Since young, Prince Mateen had a keen interest in military matters and has actively engaged in and attended a number of military-related events. On 9 May 2010, he began his commissioning course for Regular Army Officers along with 200 recruits in Royal Military Academy Sandhurst at the age of 18. On 15 April 2011, Prince Mateen graduated from the Sovereign's Parade Commissioning Course 102 as an officer cadet of the Royal Military Academy Sandhurst, United Kingdom and promoted to the rank of Second Lieutenant. After completing training at Sandhurst, he was attached to the Household Cavalry Mounted Regiment's Life Guards and the Blues and Royals.
From 27 to 29 November 2015, Prince Mateen, as a representative of his father, attended the 24th Commonwealth Heads of Government Meeting in Malta. He was also present at the Inauguration Ceremony of the Oxford Centre for Islamic Studies' new building in May 2017
Education
Prince Mateen received his primary education at the St. Andrew's School in Bandar Seri Begawan, Brunei. He continued his secondary education at the Paduka Seri Begawan Sultan Science College and Jerudong International School.
In July 2014, Prince Mateen received his Bachelor of Arts degree in international politics from King's College London at the Barbican Centre in London.In July 2016, Prince Mateen was awarded a Master of Arts degree in international studies and diplomacy from the School of Oriental and African Studies, University of London.