Wyoming Highway 139 (WYO 139) is a short 1.45-mile-long (2.33 km) spur route of Wyoming Highway 135 in south-central Fremont County.

Wyoming Highway 139 begins at Wyoming Highway 135 and travels into the small oil community of Sand Draw.

Highway 139 ends at an unmarked 3-way intersection in Sand Draw 1.45 miles later.

[2][3][4] The entire route is in Sand Draw, Fremont County.