The Yongle Encyclopedia (English: ) or Yongle Dadian (traditional Chinese: 永樂大典; simplified Chinese: 永乐大典; pinyin: Yǒnglè Dàdiǎn; Wade–Giles: Yung-lo Ta-tien; lit. 'Great Canon of Yongle') is a Chinese leishu encyclopedia commissioned by the Yongle Emperor (r. 1402–1424) of the Ming dynasty in 1403 and completed by 1408. It comprised 22,937 manuscript rolls in 11,095 volumes.