| Thoult-Trosnay | |
| Commune Status: | Commune |
| Arrondissement: | Épernay |
| Canton: | Sézanne-Brie et Champagne |
| Insee: | 51570 |
| Postal Code: | 51210 |
| Mayor: | François Robin[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Brie Champenoise |
| Coordinates: | 48.8514°N 3.6897°W |
| Elevation M: | 140 |
| Area Km2: | 14.89 |
Le Thoult-Trosnay is a commune in the Marne department in the Grand Est region in north-eastern France.
thumb|left|Petit Morin,river