| Petilla de Aragón | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Navarre#Spain Aragon#Spain |
| Pushpin Map Caption: | Location in Spain |
| Subdivision Type: | Country |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Navarre |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Comarca de Sangüesa |
| Subdivision Type4: | Judicial district |
| Subdivision Name4: | Aoiz |
| Coordinates: | 42.4614°N -1.0928°W |
| Elevation M: | 843 |
| Area Total Km2: | 27.55 |
| Population Demonym: | Petillés |
| Population Density Km2: | auto |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 50686 |
| Area Code Type: | Dialing code |
| Leader Title: | Mayor |
| Leader Name: | Jorge Sedano (2007) |
| Leader Party: | Paulino Rived Murillo |
Petilla de Aragón is a town and municipality of the autonomous community of Navarra, northern Spain. The municipality itself is formed by two enclaves, Petilla de Aragón itself and Los Bastanes (also known as Baztán de Petilla), that are entirely surrounded by the neighboring autonomous community of Aragón.
In the 15th century, Petilla was the site of a battle between the Navarrese and Aragonese armies in which the fictional troubadour Manrico and the Conte di Luna, of Verdi's Il trovatore, fought on opposite sides, not knowing they were brothers; this is recounted by the gipsy Azucena in her famous aria Stride la vampa!