The maɰ̃joꜜːɕɯː; literally "Collection of Ten Thousand Leaves" is the oldest extant collection of Japanese waka (poetry in Classical Japanese), compiled sometime after AD 759 during the Nara period. The anthology is one of the most revered of Japan's poetic compilations. The compiler, or the last in a series of compilers, is today widely believed to be Ōtomo no Yakamochi, although numerous other theories have been proposed. The chronologically last datable poem in the collection is from AD 759 ( () 4516). It contains many poems from a much earlier period, with the bulk of the collection representing the period between AD 600 and 759. The precise significance of the title is not known with certainty.
The Man'yōshū contains 20 volumes and more than 4,500 waka poems, and is divided into three genres: Zoka, songs at banquets and trips; Somonka, songs about love between men and women; and Banka, songs to mourn the death of people. These songs were written by people of various statuses, such as the Emperor, aristocrats, junior officials, Sakimori soldiers (Sakimori songs), street performers, peasants, and Togoku folk songs (Eastern songs). There are more than 2,100 waka poems by unknown authors.
The collection is divided into 20 parts or books; this number was followed in most later collections. The collection contains 265 chōka (long poems), 4,207 tanka (short poems), one an-renga (short connecting poem), one (a poem in the form 5-7-5-7-7-7; named for the poems inscribed on the Buddha's footprints at Yakushi-ji in Nara), four kanshi (Chinese poems), and 22 Chinese prose passages. Unlike later collections, such as the Kokin Wakashū, there is no preface.
The Man'yōshū is widely regarded as being a particularly unique Japanese work, though its poems and passages did not differ starkly from its contemporaneous (for Yakamochi's time) scholarly standard of Chinese literature and poetics; many entries of the Man'yōshū have a continental tone, earlier poems having Confucian or Taoist themes and later poems reflecting on Buddhist teachings.