The Nijūichidaishū (二十一代集 Collections of the Twenty-One Eras) are Japan's twenty one imperial collections (chokusenshū) of waka poetry written by noblemen. The following texts listed in chronological order constitute the Nijūichidaishū: The Hachidaishū (八代集) are the first eight collections, in which the first three collections are the Sandaishū (三代集). The Sandaishū provided both the language and organizational principles for the rest of the anthologies thereafter. They are: \n* Kokin Wakashū \n* Gosen Wakashū \n* Shūi Wakashū \n* Goshūi Wakashū \n* Kin'yō Wakashū \n* Shika Wakashū \n* Senzai Wakashū \n* Shin Kokin Wakashū The Jūsandaishū (十三代集) are the later thirteen collections. They are: \n* Shinchokusen Wakashū \n* Shokugosen Wakashū \n* Shokukokin Wakashū \n* Shokushūi Wakashū \n* Shingosen Wakashū \n* Gyokuyō Wakashū \n* Shokusenzai Wakashū \n* Shokugoshūi Wakashū \n* Fūga Wakashū \n* Shinsenzai Wakashū \n* Shinshūi Wakashū \n* Shingoshūi Wakashū \n* Shinshokukokin Wakashū Note that the Shin'yō Wakashū—although an imperial anthology of Japanese poetry—is not included in the list of twenty one collections.

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