| Trosly-Loire | |
| Commune Status: | Commune |
| Arrondissement: | Laon |
| Canton: | Vic-sur-Aisne |
| Insee: | 02750 |
| Postal Code: | 02300 |
| Mayor: | Thierry Lemoine[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 49.5194°N 3.2275°W |
| Elevation M: | 110 |
| Elevation Min M: | 43 |
| Elevation Max M: | 157 |
| Area Km2: | 15.21 |
Trosly-Loire (pronounced as /fr/) is a commune in the Aisne department in Hauts-de-France in northern France.
The river Ailette forms all of the commune's northeastern border.