| Official Name: | Mazariegos |
| Type: | municipality |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Mazariegos |
| Area Total Km2: | 25 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 42.0264°N -4.7156°W |
Mazariegos is a municipality located in the province of Palencia, Castile and León, Spain. According to the 2004 census (INE), the municipality has a population of 267 inhabitants.