Daijirō, Daijiro or Daijirou (written: 大二郎, 大二朗, 大次郎 or 大治郎) is a masculine Japanese given name. Notable people with the name include:
*, Japanese politician
*, Japanese motorcycle racer
*, Japanese mixed martial artist and professional wrestler
*, Japanese manga artist
*, Japanese rugby union player
*, Japanese baseball player
*, Japanese footballer
*, Japanese footballer
*, Japanese baseball player
*, Japanese drifting driver
{{DEFAULTSORT:Daijirou
Japanese masculine given names