| San Lucas | |
| Settlement Type: | Municipality |
| Pushpin Map: | Nicaragua |
| Pushpin Label Position: | right |
| Pushpin Mapsize: | 250 |
| Pushpin Map Caption: | Location in Nicaragua |
| Subdivision Type: | Country |
| Subdivision Name: |  Nicaragua |
| Subdivision Type1: | Department |
| Subdivision Name1: | Madriz |
| Unit Pref: | Imperial |
| Area Total Km2: | 152 |
| Population As Of: | 2023 |
| Population Total: | 16902[1] |
| Population Density Km2: | auto |
| Population Urban: | 3653 |
| Coordinates: | 13.4167°N -122°W |
| Postal Code: | 35400 |
| Blank Name: | Climate |
| Blank Info: | Aw |
San Lucas is a municipality in the Madriz department of Nicaragua. It is located 227 kilometres from the capital Managua and almost 8,5 kilometres from Somoto.[2]