Muhammad Haszaimi bin Bol Hassan is a Bruneian military officer who currently holds the position as the 12th Commander of the Royal Brunei Armed Forces (RBAF) since 2022.

Throughout Haszaimi's career, he was sent to several training institutes, which include the Officer Cadet School at Waiouru in New Zealand in 1994, the Intermediate Staff Course (ISC) at the Land Warfare Centre at Canungra in Australia in 1999, the Australian Command and Staff Course (ACSC) at the Australian Defence College, Canberra in Australia in 2007, Royal College of Defence Studies (RCDS) at London in England from 2012 to 2013, Stanford-NUS Executive Development in International Management in Singapore during August 2015, attended the Senior Executives in National and International Security at the Harvard Kennedy School in the United States in 2016.

[1] In June 1993, Haszaimi enlisted into the Royal Brunei Armed Forces (RBAF), and after completion of Initial Officer Training, graduated with the rank of second lieutenant.

[2] During the farewell to Lt. Col. Dan Hauser, the Australian Defence Adviser to Brunei Darussalam, Commander Haszaimi showed his appreciation to his service in upholding cooperation between the two nations.

[6] On 1 March 2022, Haszaimi was finally promoted to major general and appointed by Sultan Hassanal Bolkiah to be the 12th Commander of the RBAF during a ceremony held at the Istana Nurul Iman, Bandar Seri Begawan.