| Monthois | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Monthois 08.svg |
| Arrondissement: | Vouziers |
| Canton: | Attigny |
| Insee: | 08303 |
| Postal Code: | 08400 |
| Mayor: | Vincent Fleury[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Argonne Ardennaise |
| Coordinates: | 49.3128°N 4.7094°W |
| Elevation M: | 109 |
| Area Km2: | 11.98 |
Monthois (in French pronounced as /mɔ̃twa/) is a commune in the Ardennes department in northern France.
Monthois features a monument built to recognize the 372nd Infantry of the 93rd American Division, who fought a battle in the town in early October 1918.