| State: | ME |
| Type: | ME |
| Route: | 172 |
| Map Custom: | yes |
| Length Mi: | 22.65 |
| Length Ref: | [1] |
| Direction A: | South |
| Terminus A: | in Sedgwick |
| Junction: |
|
| Direction B: | North |
| Terminus B: | in Ellsworth |
| Counties: | Hancock |
| Previous Type: | ME |
| Previous Route: | 171 |
| Next Type: | ME |
| Next Route: | 173 |
State Route 172 (SR 172) is part of Maine's system of numbered state highways, located in Hancock County. It runs from SR 175 in Sedgwick to U.S. Route 1 (US 1) and SR 3 in Ellsworth. The route is 22.65miles long.