Oklahoma State Highway 136

State Highway 136 (abbreviated SH-136) is a state highway in Oklahoma. It runs 36.2 mi across Texas County in the Oklahoma Panhandle, from the adjoining state of Texas in the south to Kansas in the north. SH-136 does not have any letter-suffixed spur routes branching from it, however, it does have a truck route bypassing downtown Guymon.

State Highway 136 was designated as such to match the number of the Texas state highway to which it connects.

Route description
SH-136 begins at the Texas state line about 20 mi north of Gruver. It runs north 13 mi to Guymon, where it joins US-64, US-412 and SH-3 through the city. The routes divide five miles (8 km) north of Guymon, after crossing the Beaver River, with Highway 136 running uninterrupted the remaining 18 mi to the Kansas line.