Gantetsu could refer to either:

• Gantetsu (ガンテツ, Gantetsu), a man who claims to be a former dangerous chūnin of Iwagakure known as the Legendary Dark Shinobi (伝説の暗忍, Densetsu no Annin).
• Gantetsu (丸鉄, Gantetsu), a former Shinobazu.

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