| State: | NM |
| Type: | SR |
| Route: | 378 |
| Map Custom: | yes |
| Map Notes: | NM 378 highlighted in red |
| Maint: | NMDOT |
| Length Mi: | 3.4 |
| Length Round: | 1 |
| Length Ref: | [1] |
| Tourist: | Part of Wild Rivers Back Country Byway |
| Direction B: | East |
| Terminus B: | NM 522 north of Questa |
| Direction A: | West |
| Terminus A: | edge of BLM land |
| Counties: | Taos |
| Previous Type: | NM |
| Previous Route: | 377 |
| Next Type: | US |
| Next Route: | 380 |
State Road 378 (NM 378) is a 3.4-longNaN-long state highway in far northern New Mexico. Beginning at a junction with NM 522, NM 378 heads generally west through the small town of Cerro and officially ends shortly thereafter at the boundary of BLM lands. The paved surface continues a few miles further under a different designation to end at the BLM's Wild Rivers National Recreation Area.