State Route 126 (SR 126) is an 11.054-mile-long (17.790 km) state highway in Montgomery County, in the central part of the U.S. state of Alabama. The highway serves as both the northern and southern frontage roads between exits 11 and 16 along Interstate 85 (I-85) and U.S. Route 80 (US 80). Prior to US 80's realignment onto I-85 in November 2010, SR 126 was only the northern frontage road. SR 126 begins at itself, a consequence of the realignment as it forms a complete loop. A 308-foot-long (94 m) spur from the route's beginning marks the end of the route.

SR 126 is a two-lane highway that travels parallel to I-85 and US 80. SR 126 is routed directly north of the southbound lanes of I-85/US-80 and south of its northbound lanes. SR 126 is in clear view of I-85 and US 80 between mileposts 12 and 21 along I-85. The route north of I-85 is the original section of the highway.

This section has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This section needs expansion. You can help by adding to it. (December 2016) This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (December 2016) (Learn how and when to remove this message) (Learn how and when to remove this message)

When US 80 was rerouted onto I-85, SR 126 was extended to travel along the original route of US 80, which was the roadway paralleling the northbound lanes of I-85.

The entire route is in Montgomery County.

Location	mi	km	Destinations	Notes
Montgomery	0.000	0.000	SR 126 (Atlanta Highway west / Ryan Road east)	Western terminus
​	5.435	8.747	I-85 / US 80 west – Montgomery, Atlanta	West end of US 80 concurrency
​	5.553	8.937	US 80 east (SR 8) – Waugh, Cecil	East end of US 80 concurrency
​	6.920	11.137	SR 293 south to SR 110	Northern terminus of SR 293
Montgomery	10.740	17.284	SR 110 south	Northern terminus of SR 110
	10.850	17.461	I-85 / US 80 – Montgomery, Atlanta
	10.995	17.695	SR 126 east (Atlanta Highway east) – Alabama Technacenter
	11.054	17.790	Atlanta Highway	Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

• United States portal
• U.S. roads portal