Ninji (仁治), also called Jinji, was a Japanese era name (年号, nengō,, lit. "year name") after En'ō and before Kangen. This period spanned the years from August 1240 to January 1243. The reigning emperors were Shijō-tennō (四条天皇) and Go-Saga-tennō (後嵯峨天皇).

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