Plain Blue Banner

{{short description|One of the Manchu Empire eight banners}}

{{for|subdivision of Inner Mongolia, China|Plain Blue Banner, Inner Mongolia}}

{{Infobox military unit

| unit_name = Plain Blue Banner

| image = Plain Blue Banner.svg

| caption = Plain Blue Banner

| dates = 1601–1912

| country = Later Jin
{{flag|Qing dynasty}}

| commander5 = Prince Yu

| command_structure = Eight Banners

| type =

}}

{{Infobox Chinese

|pic=

|piccap=

|picsize=

|pictooltip=

|t= 正藍旗

|s= 正蓝旗

|p= zhènglánqí

|w=

|mi=

|suz=

|y=

|ci=

|j=

| poj =

| tl =

|mnc= ᡤᡠᠯᡠ ᠯᠠᠮᡠᠨ ᡤᡡᠰᠠ

|mnc_rom= gulu lamun gūsa

|mnc_a=

|mnc_v=

|mong=

|mon = Шулуун хөх хошуу

|monr=

|c2=

}}

The Plain Blue Banner ({{zh|t=正藍旗}}) was one of the Eight Banners of Manchu military and society during the Later Jin and Qing dynasty of China.