  State Route 121 | ||||
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 SR 121; primary in red, secondary in blue | ||||
| Route information | ||||
| Maintained by TDOT | ||||
| Length | 20.55 mi (33.07 km) | |||
| Major junctions | ||||
| South end |  CR 65 at the Alabama state line | |||
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| North end |  SR 50 in Broadview | |||
| Location | ||||
| Country | United States | |||
| State | Tennessee | |||
| Counties | Lincoln, Franklin | |||
| Highway system | ||||
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State Route 121 (SR 121) is a 20.55-mile-long (33.07 km) north–south state highway in Middle Tennessee. It connects Elora with Broadview, Tims Ford Lake, and the state of Alabama.