Flag of the Republic of the Rio Grande
| Adopted | 1840 |
|---|---|
| Relinquished | 1840 |
| Design | One-third of the hoist is blue containing three white stars. The remaining field is divided horizontally into three bars: white on top, red in the middle, and black on the bottom. |
The flag of the Republic of the Rio Grande was used in 1840, during the 283 days from January 17 to November 6, when the republic existed. This country was formed by the northeastern Mexican states of Coahuila, Nuevo León, and Tamaulipas. The flag was no longer used following the defeat of the Republic of the Rio Grande by Mexican troops.