| Official Name: | Fuentes de Oñoro |
| Settlement Type: | Municipality |
| Flag Size: | 150 |
| Pushpin Map: | Spain Castile and León#Spain |
| Pushpin Map Alt: | Location of Fuentes de Oñoro in Castile and León##Location of Fuentes de Oñoro in Spain |
| Pushpin Map Caption: | Location of Fuentes de Oñoro |
| Coordinates: | 40.5883°N -6.8131°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Salamanca |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Comarca de Ciudad Rodrigo |
| Subdivision Type4: | Subcomarca |
| Subdivision Name4: | Campo de Argañán |
| Leader Party: | PP |
| Leader Title: | Mayor |
| Leader Name: | Isidoro José Alanís Marcos |
| Area Footnotes: | [1] |
| Area Total Km2: | 57 |
| Elevation M: | 734 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 37480 |
Fuentes de Oñoro is a village and municipality in the province of Salamanca, western Spain, part of the autonomous community of Castile-Leon. It is located from the provincial capital city of Salamanca, and has a population of 1058 people. It was the site of a significant battle in 1811, during the Peninsular War.
It is a border town, and is directly connected to the most important Portuguese terrestrial border of Vilar Formoso.
The municipality covers an area of 57km2. It lies above sea level and the postal code is 37480.