| State: | ME |
| Type: | ME |
| Route: | 171 |
| Map Custom: | yes |
| Length Mi: | 17.76 |
| Length Round: | 2 |
| Length Ref: | [1] |
| Established: | 1925 |
| Direction A: | South |
| Terminus A: | in Prentiss |
| Direction B: | North |
| Terminus B: | in Reed Plantation |
| Counties: | Aroostook, Penobscot |
| Previous Type: | ME |
| Previous Route: | 170 |
| Next Type: | ME |
| Next Route: | 172 |
State Route 171 (SR 171) is part of Maine's system of numbered state highways. It runs 17.8miles from an intersection with SR 169 in Prentiss to an intersection with U.S. Route 2A (US 2A) in Reed Plantation. SR 171 travels through Drew Plantation and the unincorporated community of Wytopitlock.