| State: | GU |
| Type: | GU |
| Route: | 12 |
| Map Custom: | yes |
| Map Notes: | GH-12 highlighted in red |
| Maint: | Guam Department of Public Works |
| Direction A: | West |
| Terminus A: | in Agat |
| Direction B: | East |
| Terminus B: | in Santa Rita |
| Previous Type: | GU |
| Previous Route: | 11 |
| Next Type: | GU |
| Next Route: | 14 |
| Length Km: | 3.2 |
Guam Highway 12 (GH-12) is one of the primary automobile highways in the United States territory of Guam.
GH-12 is a short connector route that runs eastward from GH-2 through the northern part of residential Agat towards the Ordnance Annex Naval facility in Santa Rita. At the entrance, GH-12 turns north and connects to GH-5 running north then west.[1]