Hirooki Arai

Hirooki Arai (荒井 広宙, Arai Hirooki, born 18 May 1988) is a male Japanese racewalker. He competed in the 50 kilometres walk event at the 2015 World Championships in Athletics in Beijing, China.

He finished third in the 50-kilometre race walk event at the 2016 Rio Olympics, but was subsequently disqualified for making contact with Evan Dunfee of Canada, who then moved up from fourth place to claim the bronze medal. He had it given back to him after a few minutes when a Japanese appeal overturned the disqualification.

Arai serves in the Japan Ground Self-Defense Force as a second lieutenant.