Hirotoshi Masui (増井 浩俊, born June 25, 1984) is a Japanese professional baseball pitcher.

He selected 2018 NPB All-Star game [jp].

[1] Masui is a right-handed pitcher with an overhand delivery.

As a reliever, he throws a four-seam fastball (tops out at 96 mph) and a forkball as his primary pitches.

This biographical article relating to a Japanese baseball pitcher is a stub.