| Birth Name: | Awangku Hafiy Tajuddin |
| Birth Date: | 4 July 1991 |
| Birth Place: | Bandar Seri Begawan, Brunei |
| Weight: | 640NaN0 |
| Sport: | Athletics |
| Coach: | Isidro del Prado (2012) |
| Event: | 400 meters, 800 meters |
| Pb: | 400 m: 48.67 (2012) 800 m: 2:00.58 (2011) |
Awangku Hafiy Tajuddin bin Pengiran Rositi[1] (Arabic: أك حافي تجدين روستي; born 4 July 1991) is a Bruneian runner.[2]
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.[3] 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.[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.[5] He was banned for 2 years, with the sanction ending on 24 December 2015.[6] [7]