| Type: | Municipality |
| Official Name: | Santiago Millas |
| Pushpin Map: | Spain |
| Subdivision Name3: | Santiago Millas |
| Area Total Km2: | 39 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Coordinates: | 42.3833°N -12°W |
Santiago Millas is a municipality located in La Maragatería, province of León, Castile and León, Spain. According to the 2004 census (INE), the municipality had a population of 335.