| Leffincourt | |
| Commune Status: | Commune |
| Arrondissement: | Vouziers |
| Canton: | Attigny |
| Insee: | 08250 |
| Postal Code: | 08310 |
| Mayor: | Christophe Manceaux[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Argonne Ardennaise |
| Coordinates: | 49.3878°N 4.5472°W |
| Elevation M: | 128 |
| Elevation Min M: | 113 |
| Elevation Max M: | 183 |
| Area Km2: | 18.02 |
Leffincourt (in French pronounced as /lefɛ̃kuʁ/) is a commune in the Ardennes department in northern France.