| State: | ME |
| Type: | SR |
| Route: | 198 |
| Map Custom: | yes |
| Length Mi: | 10.69 |
| Length Ref: | [1] |
| Direction A: | South |
| Direction B: | North |
| Terminus A: | Summit Street / Main Street in Village of Northeast Harbor |
| Terminus B: | in Bar Harbor |
| Counties: | Hancock |
| Previous Type: | SR |
| Previous Route: | 197 |
| Next Type: | SR |
| Next Route: | 199 |
State Route 198 (SR 198) is a state highway on Mount Desert Island, Hancock County, Maine. It goes from the village of Northeast Harbor within the town of Mount Desert to State Routes 3 and 102 in Bar Harbor. The route passes near the Gulf of Maine and through Acadia National Park.
SR 198 begins in the village of Northeast Harbor. It heads northward and has a concurrency with SR 3 from Northeast Harbor and intersects SR 233. Near Somesville, SR 3 ends but SR 198 turns north along the route of SR 102. SR 198 and SR 102 run together for 4miles and enter Bar Harbor. Both routes have their northern end at SR 3.