Junshirō Kobayashi (小林 潤志郎, Kobayashi Junshirō, born 11 June 1991) is a Japanese ski jumper.

He represented Japan at the FIS Nordic World Ski Championships 2015 in Falun, where he finished 13th place on large hill and 25th place on normal hill.

He won three times in Grand Prix competition in Almaty and Hakuba.

He finished in 3rd place overall in the 2017 FIS Ski Jumping Grand Prix season.

[1][2][3] On 19 November 2017, he claimed his first World Cup win in Wisła and became the thirteenth Japanese ski jumper with at least one World Cup win.