Hiroaki Doi (土井宏昭, Doi Hiroaki, born December 2, 1978) is a Japanese hammer thrower. His personal best throw is 74.08 metres, achieved in June 2007 in Inba.
| Year | Competition | Venue | Position | Notes |
|---|---|---|---|---|
Representing  Japan
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| 2002 | Asian Championships | Colombo, Sri Lanka | 2nd | 70.27 m |
| Asian Games | Busan, South Korea | 2nd | 69.57 m | |
| 2003 | Asian Championships | Manila, Philippines | 2nd | 70.11 m |
| 2005 | Asian Championships | Incheon, South Korea | 3rd | 68.50 m |
| East Asian Games | Macau | 1st | 70.35 m | |
| 2006 | Asian Games | Doha, Qatar | 3rd | 69.45 m |
| 2007 | World Championships | Osaka, Japan | 26th (q) | 69.89 m |
| Asian Championships | Amman, Jordan | 3rd | 70.74 m | |
| 2009 | Asian Championships | Guangzhou, China | 4th | 69.75 m |
| East Asian Games | Hong Kong | 1st | 71.25 m | |
| 2010 | Asian Games | Guangzhou, China | 3rd | 68.72 m |
| 2011 | Asian Championships | Kobe, Japan | 3rd | 70.69 m |
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