List of state highways in Montana
| Montana Highway System | |
|---|---|
Map of main highways within Montana | |
| System information | |
| Maintained by MDT | |
| Formed | 1942 |
| Highway names | |
| Interstates | Interstate nn (I-nn) |
| US Highways | U.S. Highway n (US n) |
| State | Montana Highway n (MT n) |
| Secondary | Secondary Highway nnn (S-nnnn) |
| System links | |
The state highways in Montana are the state highways owned and maintained by the Montana Department of Transportation (MDT) in the US state of Montana.
Montana's state highways are classified as either primary or secondary. Several of Montana's state highways (both primary and secondary), or sections thereof, have also been designated as part of the National Highway System.