State Highway 86 or SH 86 is a state highway in the U.S. state of Texas that runs 149 miles (240 km) from Bovina to Estelline. This route was designated in 1926 as the renumbered SH 5A. It has travelled its present course since then, except for the addition of the northern portion of SH 18 between Turkey and Estelline around 1939.