Tennessee State Route 123 (SR 123) is a state route in the U.S. state of Tennessee. It serves to link SR 68 with NC 294, at the Tennessee/North Carolina state line.
SR 123 is a short 1.3-mile (2.1 km) highway entirely in Polk County and Cherokee National Forest. Two-lane throughout and no shoulders, it servers primary as a link, with NC 294, to connect travelers from Turtletown and Farner, in Tennessee, to Murphy and the Hiwassee Dam, in North Carolina.
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The entire route is in Polk County.