| Conflict: | Battle of Yerbal |
| Partof: | the Cisplatine War |
| Date: | 25 May 1827 |
| Place: | Near Pedras Altas, Rio Grande do Sul, southern Brazil |
| Result: | Both sides claim victory |
| Combatant2: |  United Provinces |
| Commander1: | Bonifácio Isás Calderón |
| Commander2: | Juan Lavalle |
| Strength1: | 400 |
| Strength2: | 891 |
| Casualties1: | Unknown |
| Casualties2: | 2 wounded |
The Battle of Yerbal, also known as the Battle of Erval or Battle of Pedras Altas, was fought on 25 May 1827 between a militia force of the Imperial Brazilian Army and an Argentine cavalry detachment in the context of the Cisplatine War.
Lieutenant-colonel Bonifácio Isás Calderón, leading 400 militiamen, confronted an 891 men strong Argentine cavalry detachment in the vicinity of Pedras Altas. The Argentine commander, Juan Lavalle, decided to flee and was pursued until the night. Lavalle and captain Maciel, his second in command, were wounded while charging against the Brazilians.