Wyoming Highway 77 (WYO 77) is a 22.18-mile (35.70 km) long Wyoming state highway in northeastern Carbon County.

The highway begins at WYO 487 and proceeds north, parallel to the highway, to a northern terminus at WYO 487.

At its northern terminus, Highway 77 is about 48 miles (77 km) south of the city of Casper.

The entirety of Highway 77 maintains a speed limit of 65 miles per hour (105 km/h), and is closed during winters.

[1][2] The entire route is in Carbon County.