| Unit Name: | Plain Blue Banner |
| Dates: | 1601–1912 |
| Country: | Later Jin |
| Commander5: | Prince Yu |
| Command Structure: | Eight Banners |
| T: | 正藍旗 |
| S: | 正蓝旗 |
| P: | zhènglánqí |
| Mnc: | ᡤᡠᠯᡠ ᠯᠠᠮᡠᠨ ᡤᡡᠰᠠ |
| Mnc Rom: | gulu lamun gūsa |
| Mon: | Шулуун хөх хошуу |
The Plain Blue Banner was one of the Eight Banners of Manchu military and society during the Later Jin and Qing dynasty of China.