| Official Name: | Urretxu |
| Pushpin Map: | Spain Basque Country |
| Pushpin Map Caption: | Location of Urretxu within the Basque Country |
| Coordinates: | 43.0917°N -2.3139°W |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Gipuzkoa |
| Subdivision Type3: | Eskualdea |
| Subdivision Name3: | Urola Garaia |
| Leader Title: | Mayor |
| Area Total Km2: | 16.88 |
| Elevation M: | 355 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 20700 |
| Area Code Type: | Dialing code |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
Urretxu (Spanish, Villareal de Urrechu) is a town located in the province of Gipuzkoa, in the Autonomous Community of the Basque Country, northern Spain.
Situated on the Urola river, it is contiguous with the larger town of Zumarraga immediately to the south, with the river making the boundary between them.