Tetsuta Nagashima

is a Japanese Grand Prix motorcycle racer who competes in the JSB1000 class of the All Japan Road Race Championship for Dunlop Racing Team, aboard a Honda CBR1000RR-R SP. He was the All Japan GP-Mono champion in 2011. Nagashima has competed in the Moto2 World Championship in 2014—and between 2017 and 2020. He is a race winner of the same category, having clinched the 2020 Qatar motorcycle Grand Prix. Nagashima has also raced in MotoGP in 2022, as replacement rider.

He is currently an HRC test rider and occasionally wildcards in the Superbike World Championship.