Masao Kobayashi (小林政男 Kobayashi Masao, こばやし まさお Kobayashi Masao) is a fictional character in Kunio-kun series. Coming from an upper-class background, he is a leader of the "Shitennō" (Four Heavenly Kings), a group of some of the most feared fighters from Reihou Academy under Takashi Onizuka in Downtown Nekketsu Monogatari.
- In River City Ransom, Kobayashi was renamed Thor and is the leader of The Zombies.
- In Crash 'n the Boys: Street Challenge, Kobayashi was renamed Worthington "Monty" Montgomery, a member of Team Lincoln High School.
- His name is spelled Kobayasi (no "h") in some games, including River City Melee: Battle Royal Special.