| Guadassuar | |
| Settlement Type: | Municipality |
| 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: | Ribera Alta |
| Subdivision Type4: | Judicial district |
| Subdivision Name4: | Alzira |
| Coordinates: | 39.1833°N -0.4781°W |
| Elevation M: | 25 |
| Area Total Km2: | 35.3 |
| Population Demonym: | Guadassuarenc / Malnom: Carabassot |
| 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: | 46610 |
| Area Code Type: | Dialing code |
| Leader Title: | Alcalde |
| Leader Name: | José Ribera Añó |
Guadassuar (pronounced as /ɡwaðasuˈaɾ/) is a municipality in the comarca of Ribera Alta in the Valencian Community, Spain.