State Route 123 (SR 123) is a 45.750-mile (73.627 km) state highway that serves Geneva, Houston, and Dale counties as a connection between Hartford, Ozark, and Ariton.

SR 123 intersects SR 167 and Geneva County Route 61 (CR 61) at its southern terminus, south of Hartford and US 231 at its northern terminus, west of Ariton.

[2] From this point, the highway travels in a northerly direction where it intersects SR 52 in the central business district of Hartford.

[1] From the end of this concurrency through Ozark, SR 123 continues generally in this northern course in passing both Fort Novosel and Blackwell Field.

[6] Upon leaving Ozark, the highway continues in a northwesterly course en route to Ariton where it then turns in a westerly direction where it meets its northern terminus with US 231.