| State: | GU |
| Type: | GU |
| Route: | 3 |
| Map Custom: | yes |
| Map Notes: | GH-3 highlighted in red |
| Maint: | Guam Department of Public Works |
| Direction A: | South |
| Terminus A: | in Tamuning |
| Junction: | in Gugagon |
| Direction B: | North |
| Terminus B: | in Dededo |
| Previous Type: | GU |
| Previous Route: | 2 |
| Next Type: | GU |
| Next Route: | 4 |
Guam Highway 3 (GH-3) is one of the primary automobile highways in the United States territory of Guam.
It runs in a south to north direction, from a junction with GH-1 near the Micronesia Mall in the southern community of Tamuning in a general northeasterly direction to the community of Dededo, where it meets GH-3A and GH-9. In between, it passes Naval Computer and Telecommunications Station Guam and the newly-established Marine Corps Base Camp Blaz.[1]
Guam Highway 3A (GH-3A) connects GH-3 and GH-9 to Ritidian Point at the northern tip of the island of Guam in Dededo. It is undergoing expansion to accommodate increased activity from the activation of Camp Blaz.