Awangku Hafiy Tajuddin bin Pengiran Rositi[1][2] (Arabic: أك حافي تجدين روستي; born 4 July 1991) is a Bruneian runner.

The 4th Borneo Games' sixth day saw him winning gold in the men's 800 meter category with a time of 2:00.58s.

[4] 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.