Hiroki Watanabe

is a Japanese sprint canoeist born in Yamanashi prefecture. He won a bronze medal, along with his partner Keiji Mizumoto, in the men's kayak doubles (1000 m) at the 2010 Asian Games in Guangzhou, China.

Watanabe qualified for the men's K-2 200 metres at the 2012 Summer Olympics in London by placing first at the 2011 Asian Canoe Sprint Championships in Tehran, Iran. Watanabe and his partner Momotaro Matsushita paddled to a second-place finish, and tenth overall in the B-final by twenty-four hundredths of a second (0.24) behind the Kazakh pair Alexey Dergunov and Yevgeniy Alexeyev, posting their time of 35.739 seconds.