| San Millán / Donemiliaga | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Basque Country#Spain |
| Pushpin Map Caption: | Location within Basque Country |
| Subdivision Type: | Country |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Type3: | Eskualdea / Comarca |
| Subdivision Name3: | Rioja Alavesa |
| Coordinates: | 42.8747°N -2.3761°W |
| Area Total Km2: | 85,41 |
| Established Title: | Founded |
| Established Date: | before |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Blank Info Sec1: | Basque, Spanish |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 01208 |
| Area Code Type: | Dialing code |
| Leader Title: | Mayor |
| Leader Name: | Erika Letamendi Hurtado |
| Leader Party: | EH Bildu |
San Millán in Spanish or Donemiliaga in Basque is a scattered municipality made up of several villages located in the province of Araba (Álava), in the Basque Country, northern Spain. Its biggest nucleus is the village San Roman, lying at the south of the important road axis E-5 E-80 N-1 cutting its way east to west through the Alavese Plains. Other localities include Galarreta and Munain.