Back Bandera de la provincia de San Juan Spanish Vlag van San Juan Dutch Bandeira da província de San Juan Portuguese
 | |
| Use | National flag and ensign   ≈ |
|---|---|
| Proportion | 9:14 |
| Adopted | December 17, 2018 |
.svg) | |
| Use | Reverse flag  |
The province of San Juan Province, Argentina in Argentina uses as its provincial flag the banner used by the 4th Division of the Army of the Andes during the Argentine War of Independence. The flag consists of a white stripe between two light blue stripes, forming an even, horizontal triband. This is a rare case of a flag whose two sides are clearly distinct from each other. The side showing the provincial coat of arms in the center is considered the obverse, while the reverse contains the Sun of May.