Hyoto Ryukyukoku ki
- Author: Keisei
- Japanese: 漂到流球国記 (hyôtô Ryûkyû koku ki)
The Hyôtô Ryûkyû koku ki is a record of the experiences of a group of Japanese castaways who, in 1243, set out from Ojika Island and became shipwrecked in a place they record as having been Ryûkyû. The original document is today held by the Imperial Household Agency.
Written by the monk Keisei (1189-1268), an older brother of Kujô Michiie, the text includes description and depiction of a battle between two different groups of Ryukyuans, armed with shields and spears. It also describes the castaways' own ship being attacked by Ryukyuans in red clothing and hats, armed with bow and arrow.
- Akamine Mamoru, Lina Terrell (trans.), Robert Huey (ed.), The Ryukyu Kingdom: Cornerstone of East Asia, University of Hawaii Press (2017), 11.
- Tomiyama Kazuyuki, "漂到流球国記," 琉球・沖縄之歴史と文化と語る多彩な資料, University of the Ryukyus Library.