State Route 77 or SR-77 is a north–south highway in eastern Alabama that runs from U.S. Highway 431 near Lafayette and ends at U.S. Highway 431 just north of Attalla. North of Talladega, the route passes the entrance to Talladega Superspeedway, home of the NASCAR Sprint Cup, Nationwide Series and Camping World Truck Series races that are held annually.

The original route of SR-77 was established in 1940, running from Lafayette to Ashland. By 1961, the route was extended to its current terminus in northwestern Etowah County. Until 1985, the segment of the route between Talladega and Lincoln was co-signed as Alternate U.S. Highway 231.