| State: | SD |
| Type: | SD |
| Route: | 377 |
| Section: | 234 |
| Map Notes: | Location of SD 377 (in red) |
| Length Mi: | 2.173 |
| Length Ref: | [1] |
| Established: | 1976 |
| Direction A: | South |
| Terminus A: | in Interior |
| Direction B: | North |
| Terminus B: | Interior Entrance Station in Badlands National Park |
| Counties: | Jackson |
| Previous Type: | SD |
| Previous Route: | 365 |
| Next Type: | US |
| Next Route: | 385 |
South Dakota Highway 377 (SD 377) is a 2.173adj=midNaNadj=mid state highway in Jackson County, South Dakota, United States. It begins at an intersection with SD 44 in Interior, and travels in a northeasterly direction to its northern terminus at the Interior Entrance Station for Badlands National Park.
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SD 377 begins at an intersection with SD 44 in the northeastern part of Interior. It is a near-straight two-lane highway for its entire length. It ends at the Interior Entrance Station for Badlands National Park.