| Massalfassar | |
| Settlement Type: | Municipality |
| Official Name: | Masalfasar |
| Native Name: | Masalfasar |
| Pushpin Map: | Spain |
| Pushpin Map Caption: | Location in Spain |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Valencia |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Horta Nord |
| Subdivision Type4: | Judicial district |
| Subdivision Name4: | Massamagrell |
| Coordinates: | 39.5611°N -0.325°W |
| Elevation M: | 9 |
| Area Total Km2: | 2.5 |
| Population Demonym: | Massalfassarí/na |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Blank Info Sec1: | Valencian |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 46560 |
| Area Code Type: | Dialing code |
| Leader Title: | Alcalde |
| Leader Name: | Joaquín Soler Garibo (2003) |
| Leader Party: | PP |
Massalfassar is a municipality in the comarca of Horta Nord in the Valencian Community, Spain.