| Country: | MEX |
| Type: | FH |
| Route: | 186 |
| Maint: | Secretariat of Communications and Transportation |
| Length Km: | 574.4 |
| Length Round: | 1 |
| Length Ref: | [1] |
| Direction A: | East |
| Terminus A: | Chetumal[2] |
| Direction B: | West |
| Terminus B: | in Villahermosa |
| Previous Type: | FH |
| Previous Route: | 185 |
| Next Type: | FH |
| Next Route: | 187 |
Federal Highway 186 (Carretera Federal 186) is a Federal Highway of Mexico.[3] The highway travels from Villahermosa, Tabasco, in the west to Chetumal, Quintana Roo, in the east. In the state of Campeche it passes through the city of Escárcega, where there is a junction with Federal Highway 261.