| Arantzazu | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Basque Country |
| Pushpin Map Caption: | Location of Arantzazu within the Basque Country |
| Pushpin Map1: | Spain |
| Pushpin Map Caption1: | Location of Arantzazu within Spain |
| Subdivision Type: | Country |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Basque Country |
| Subdivision Type2: | Province |
| Subdivision Name2: | Biscay |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Arratia-Nerbioi |
| Coordinates: | 43.1575°N -2.7892°W |
| Elevation M: | 144 |
| Area Total Km2: | 3.80 |
| Population Demonym: | Basque: arantzazuarra |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 48140 |
| Area Code Type: | Dialing code |
| Leader Title: | Mayor |
| Leader Name: | Igor Menika Bengoetxea |
| Leader Party: | EH Bildu |
Arantzazu (Spanish Aránzazu) is a town and municipality located in the province of Bizkaia, in the Autonomous Community of Basque Country, northern Spain.