| Province: | QC |
| Type: | QC |
| Route: | 125 |
| Maint: | Transports Québec |
| Map: | Route 125-QC.png |
| Length Km: | 132.6 |
| Length Round: | 1 |
| Direction B: | North |
| Direction A: | South |
| Terminus A: | in Montréal |
| Terminus B: | Mont-Tremblant National Park in Saint-Donat |
| Junction: | in Montréal in Laval in Laval and Terrebonne in Saint-Esprit |
| Previous Type: | QC |
| Previous Route: | 122 |
| Next Type: | QC |
| Next Route: | 131 |
Route 125 is a Quebec highway running from Montreal (on Pie-IX Boulevard near the Olympic Stadium) to Saint-Donat, Lanaudière, Quebec in the Lanaudière. The southern section of Route 125 runs parallel to Autoroute 25 in Laval, Mascouche, and Terrebonne. At Saint-Esprit, the Autoroute ends, and 125 continues northwards until the entrance to the Mont Tremblant Provincial Park north of Saint-Donat.