| Official Name: | Arevalillo de Cega |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Castile and León#Spain |
| Pushpin Map Caption: | Location in Spain. |
| Subdivision Name3: | Arevalillo de Cega |
| Area Total Km2: | 11.59 |
| Elevation M: | 1047 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Arevalillo de Cega is a municipality located in the province of Segovia, Castile and León, Spain. According to the 2004 census (INE), the municipality had a population of 42 inhabitants.