| Official Name: | Undués de Lerda, Spain |
| Subdivision Name3: | Undués de Lerda |
| Area Total Km2: | 43 |
| Elevation M: | 633 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Undués de Lerda is a municipality located in the province of Zaragoza, Aragon, Spain. According to the 2004 census (INE), the municipality has a population of 60 inhabitants.