| Province: | QC |
| Type: | QC |
| Route: | 139 |
| Maint: | Transports Québec |
| Map: | Route 139-QC.png |
| Length Km: | 124.1 |
| Length Round: | 1 |
| Length Ref: | [1] |
| Direction B: | North |
| Direction A: | South |
| Terminus A: | in Richford, Vermont |
| Terminus B: | in Saint-Nicéphore (Drummondville) |
| Previous Type: | QC |
| Previous Route: | 138 |
| Next Type: | QC |
| Next Route: | 141 |
| Counties: | Brome-Missisquoi / La Haute-Yamaska / Acton / Drummond |
| Junction: | in Sutton in Cowansville in Saint-Alphonse-de-Granby in Granby in Roxton Falls in Acton Vale in Saint-Nicephore |
Route 139 is a north/south highway on the south shore of the Saint Lawrence River. Its northern terminus is in Saint-Nicéphore, now part of Drummondville, at the junction of Route 143, and the southern terminus is in Abercorn at the border with Richford, Vermont at the Richford–Abercorn Border Crossing.
| RCM or ET | Municipality | Km | Junction | Notes | ||
|---|---|---|---|---|---|---|
| Brome-Missisquoi | Abercorn | 0.0 | SOUTH: to Richford, Vermont | |||
| Sutton | 11.5 | (South end) | 215 NORTH: to Brome | |||
| Cowansville | 24.0 | (Overlap 10.7 km) | 104 EAST: to Brome Lake | |||
| 26.7 | (South end) | 241 NORTH: to Bromont | ||||
| 31.8 | (East end) | 202 WEST: to Dunham | ||||
| 34.7 | (Overlap 10.7 km) | 104 WEST: to Farnham | ||||
| East-Farnham | 40.0 | Avenue-des-Érables | WEST: to Brigham | |||
| La Haute-Yamaska | Saint-Alphonse-de-Granby | 49.9 50.3 | 10 EAST: to Bromont 10 WEST: to Ange-Gardien | |||
| Granby | 58.3 | 112 WEST: to Saint-Paul-d'Abbotsford 112 EAST: to Waterloo | ||||
| Acton | Roxton Falls | 88.8 | (North end) | 241 SOUTH: to Saint-Joachim-de-Shefford | ||
| 89.4 | (West end) | 222 EAST: to Sainte-Christine | ||||
| Acton Vale | 98.3 99.1 | (Overlap 0.8 km) | 116 WEST: to Upton 116 EAST: to Durham-Sud | |||
| Drummond | Wickham | 114.0 | Rue Blanchard | SOUTH: to Lefebvre | ||
| Saint-Nicéphore | 122.1 122.6 | 55 SOUTH: to L'Avenir 55 NORTH: to Drummondville | ||||
| 124.1 | 143 SOUTH: to L'Avenir 143 NORTH: to Drummondville | |||||