Wyoming Highway 391 is a short, albeit signed, Wyoming State Road for the Wyoming Department of Transportation (WYDOT) Maintenance Shop for the Jackson Area.

Wyoming Highway 391 travels from US 26/US 89/US 189/US 191 west to the Jackson Area WYDOT Maintenance Shop where it ends.The raodway continues past the maintenance shop as Evans Road.

The entire route is in Jackson, Teton County.

List of state highways in the United States shorter than one mile Wyoming Highway 224