Kazuma Watanabe (渡辺 一馬, Watanabe Kazuma, born 6 May 1990)[1] is a Japanese motorcycle racer, competing in the All Japan Road Race JSB1000 Championship aboard a Kawasaki ZX-10R.

He has competed in the GP125 and J-GP2 classes of the All Japan Road Race Championship, as well as in the ST600 class, where he was champion in 2013.