| Geolsa Biu | |
| T: | 乞四比羽 |
| P: | Qǐsì Bǐyǔ |
| Hangul: | 걸사비우 |
| Hanja: | 乞四比羽 |
| Rr: | Geolsa Biu |
| Mr: | Kŏlsa Piu |
| Ibox-Order: | zh, ko1, ko4, ko3 |
Geolsa Biu, also rendered as Qisi Biyu, was a 7th-century military leader of Baishan Mohe ancestry. Geolsa Biu took an active part in Balhae's effort for autonomy against the Tang dynasty.[1] Geolsa Biu died in the Battle of Tianmenling, in which Balhae achieved victory and declared autonomy.