| Lannemaignan | |
| Commune Status: | Commune |
| Arrondissement: | Condom |
| Canton: | Grand-Bas-Armagnac |
| Insee: | 32189 |
| Postal Code: | 32240 |
| Mayor: | Christian David[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Grand-Armagnac |
| Coordinates: | 43.9014°N -0.1994°W |
| Elevation M: | 110 |
| Elevation Min M: | 59 |
| Elevation Max M: | 117 |
| Area Km2: | 8.58 |
Lannemaignan (in French pronounced as /lanmɛɲɑ̃/; Occitan (post 1500);: Lanamanhan) is a commune in the Gers department in southwestern France.