- Born: 1718
- Died: 1797
- Other Names: 馬 国器 (Ba Kokki / Mǎ Guóqì)
- Japanese: 与那原 良矩 (Yonabaru Ryouku)
Yonabaru Ryôku was a Ryukyuan scholar-official who served as a member of the Sanshikan for 28 years, from 1769 until 1797. He is also considered one of the 36 greatest poets of Ryûkyû.
Yonabaru was a member of a branch of the Uruku dunchi Ba family started by Ba Urasoe ueekata Ryôsen; this branch held the position of sô-jitô of Ôzato magiri.
- Explanatory plaque at Yonabaru's birthplace, Naha-shi Shuri Gibo-chô 3-14.