| Official Name: | Mazaleón/Massalió |
| Pushpin Map: | Spain Aragon#Spain |
| Pushpin Map Caption: | Location of Mazaleón/Massalió within Aragon##Location of Mazaleón/Massalió within Spain |
| Coordinates: | 41.05°N 7°W |
| Subdivision Name3: | Mazaleón/Massalió |
| Area Total Km2: | 85 |
| Elevation M: | 359 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Mazaleón (pronounced as /es/ or Massalió (pronounced as /ca/) is a municipality located in the Matarraña/Matarranya comarca, province of Teruel, Aragon, Spain. According to the 2004 census (INE), the municipality has a population of 587 inhabitants.