Ak Hafiy Tajuddin Rositi

Awangku Hafiy Tajuddin bin Pengiran Rositi (أك حافي تجدين روستي; born 4 July 1991) is a Bruneian runner.

Career
Hafiy Taujddin was born in Bandar Seri Begawan, the fifth of ten children. The 4th Borneo Games' sixth day saw him winning gold in the men's 800 meter category with a time of 2:00.58s. He competed at the 2012 Summer Olympics in the 400 m event and he was defeated in the first round although he finished in his personal best time of 48.67s.

Doping
The national runner was "randomly tested and was found positive with Adverse Analytical Finding (AAF), with the presence of a prohibited substance Anabolic Steroids (19- Narandosterone) of Exogernous origin," according to a news release issued by the Brunei Darussalam National Olympic Council (BDNOC) on 29 April 2014. Following his participation in the men's 400-meter race at the 27th Southeast Asian Games in Myanmar in December, where he placed last in his heats with a time of 49.94s, Ak Hafiy was randomly tested by the Southeast Asian Federation (SEAGF) Medical Committee. Prince Sufri Bolkiah, the President of the BDNOC, emphasized in a statement that athletes should abstain from doping. He was banned for 2 years, with the sanction ending on 24 December 2015.