Military career Prince Mateen began his military career by following in his father's footsteps. He enrolled in the 44 week Regular Commissioning Course at
Royal Military Academy Sandhurst along with over 200 other recruits on 9 May 2010. Prince Mateen graduated and participated in the 102nd
Sovereign's Parade on 15 April 2011. Upon completion of the course, he was promoted to the rank of
Second Lieutenant. Prince Mateen was then attached to the
Household Cavalry Mounted Regiment's
Life Guards and
Blues and Royals at
Hyde Park Barracks, London. He was promoted to the rank of
Lieutenant on 15 September 2012. On 28 April 2017, Prince Mateen completed a seven month Elementary Flying Training course on a
Grob G 115 aircraft at
RAF Cranwell. He was promoted to
Captain in the
Royal Brunei Air Force on 9 May 2017 after serving as an acting captain since 9 May 2016. From September 2017 to March 2018, Prince Mateen completed the Single Engine Rotary Wing training at the
Defence Helicopter Flying School at
RAF Shawbury. He qualified as a helicopter pilot while training on
Squirrel HT1/2 and
Griffin HT1 helicopters. The Sultan presented Prince Mateen with his
Aircrew Flying Badge (wings) at his graduation ceremony on 28 March 2018. In September he underwent Helicopter Underwater Escape Training at the Megamas Training Company and in November he completed the first stage of his training on the
S-70i Black Hawk helicopter at
CAE Brunei Multi-Purpose Training Centre. On 30 June 2019, the Sultan presented Prince Mateen with honorary membership in the Special Forces Regiment as part of the celebrations honoring the 58th anniversary of the
Royal Brunei Armed Forces. That same year, he completed the Basic Airborne Static Line and Basic Military Freefall training which qualifies him to perform jumps from aircraft and he underwent Aviation Physiology Training at Singapore Aeromedical Centre. Later that year, Prince Mateen underwent the
All Arms Commando Course at the
Commando Training Centre Royal Marines in the United Kingdom for eleven weeks from September to December and was one of the top ten in the course. He received his
Green Beret at the graduation ceremony on 4 December 2021 which was presented by his father, Sultan Hassanal Bolkiah. On 23 September 2022, Prince Mateen was awarded the
Parachute Badge with Wings at
RAF Brize Norton after completing the
Basic Parachute Course. The RAF reported that he had spent the previous two weeks training alongside 64 other new parachutists. From September 2024 to July 2025, Prince Mateen completed the
Advanced Command and Staff Course at the
Defence Academy of the United Kingdom. On July 18th, the Sultan attended his graduation ceremony and presented him with the Pass Staff College Certificate and the Cormorant Pin, which is awarded to international course members. On 6 November 2025, Prince Mateen was promoted to the rank of
Lieutenant Colonel in the RBAF.
Diplomatic career In November 2015, Prince Mateen, as a representative of his father, attended the
Commonwealth Heads of Government Meeting in
Malta. He again attended the
2022 Commonwealth Heads of Government Meeting in
Rwanda this time alongside his father. He was present at the Inauguration Ceremony of the
Oxford Centre for Islamic Studies' new building in May 2017. Following leaders' bilateral meetings in
Amman on 4 October 2018, which saw the signing of three
memorandum of understanding in the areas of infrastructure, tourism, and defense in addition to a customs cooperation agreement, Brunei and Jordan reaffirmed their longstanding alliance. The negotiations were held at Al-Husseinieh Palace with participation from senior cabinet members from both nations as well as Prince Mateen and Crown Prince
Al Hussein. On 19 October 2019, alongside his father, he attended the 12th
Asia–Europe Meeting (ASEM) in
Brussels, where Brunei demanded that talks to get back up a
Free Trade Agreement (FTA) between the
European Union (EU) and
ASEAN. On 3 November 2019, the 35th
ASEAN Summit and Related Summits' Opening Ceremony was attended by both father and son at
Muang Thong Thani. From 13 to 14 March 2023, Prince Mateen took part in a comprehensive tour of the
Coronado,
California-based
Naval Special Warfare (NSW) commands. He met with members of NSW and
Rear Admiral Keith B. Davids, chief of
Navy Special Warfare Command, to talk about potential areas of future cooperation. Prince Mateen regularly represents the royal family at foreign royal events usually alongside his father. On 22 October 2019, he attended the
enthronement ceremony of
Emperor Naruhito of Japan In September 2022, he and his father were present at
Westminster Abbey for the
state funeral of
Queen Elizabeth II of the United Kingdom and again in May 2023 for the
coronation of
King Charles III. In June 2023, he attended the wedding celebrations of
Crown Prince Hussein of Jordan and
Rajwa bint Khalid Al Saif. In July 2024, Prince Mateen and his wife,
Anisha Rosnah, traveled to Kuala Lumpur for the
installation of
Ibrahim Iskandar of Johor as the 17th
King of Malaysia. In April 2011, the Sultan appointed Prince Mateen as a member of the
Privy Council and he is also the Deputy Chairman 2 of the , or the Department of State Customs.
Sports career Prince Mateen is an avid
polo player along with other members of the Bruneian royal family. He has represented his country in polo three times in the
Southeast Asian Games. At the
2017 SEA Games, the Bruneian national team that included both Prince Mateen and his sister,
Princess Azemah, earned a bronze medal. Nearly 3,000 spectators came to watch the match between Brunei and
Malaysia. At the
2019 SEA Games, Mateen, Azemah and the rest of the Bruneian team again won the bronze medal. In 2024, Mateen played on the national team at the All Asia Cup in Thailand where they won the silver medal. At the
2025 SEA Games, Mateen, Azemah and the rest of the Bruneian team earned a silver medal in the low goal division and a bronze medal in the high goal division. In 2018, Prince Mateen founded his own professional polo team called MB Polo. He plays on the team along with
Pablo Mac Donough. They compete at the annual Gold Cup of the Torneo Internacional de Polo in
Sotogrande, Spain. In 2018, MB Polo came in second place at the Gold Cup medium goal finals. They won the high goal Gold Cup final for the first time in 2019 and came in second in 2023. On 7 April 2007, the AM Gunners
captained by Abdul Mateen ended in a 1–1 draw against team Projek Ikan Pusu (PIP) during a
Charity football match. The match which took place at the
Hassanal Bolkiah National Stadium collected a total of
B$12,192. A charity match between Mateen-led AM Gunners and Sport School was again held at the same location on 22 March 2008. In 2020, Prince Mateen opened Jab Gym in Brunei. It is a primarily a boxing gym but also offers other fitness classes. == Personal life ==