Wyoming Highway 434 is a 20.63-mile (33.2 km) Wyoming state road in Washakie county.

Wyoming Highway 434 begins its southern end in an area called Big Trails, 20 miles south of Ten Sleep, at Washakie CR 82. Highway 434 proceeds north from here to the Town of Ten Sleep where it reaches its northern terminus at US Route 16 (2nd Street).

The entire route is in Washakie County.