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 baseball player , Japanese drifting driver