State Route 240 (SR 240) is a 17.2-mile-long (27.7 km) north–south state highway in Lawrence County, Tennessee. Except for a short stretch in Summertown, the entire route of SR 240 is known simply as Turnpike.

SR 240 begins as Turnpike just west of Deerfield at an intersection with US 64/SR 15. It goes northeast along the southern edge of Laurel Hill Wildlife Management Area to pass through farmland and have a short concurrency with SR 241 before passing through Henryville, where it has an intersection with SR 242. The highway then crosses the Buffalo River passes through a mix of farmland and wooded areas before entering Summertown, where it turns east to have a concurrency with SR 20 before turning south along Monument road and coming to an end at an intersection with US 43/SR 6. The entire route of SR 240 is a two-lane highway.

The entire route is in Lawrence County.

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Location	mi	km	Destinations	Notes
​	0.0	0.0	US 64 (Waynesboro Highway/SR 15) – Waynesboro, Lawrenceburg	Southern terminus
​			SR 241 north (Napier Road)	Southern end of wrong-way SR 241 concurrency
​			SR 241 south (Red Hill-Center Road) – Deerfield	Northern end of wrong-way SR 241 concurrency
Henryville			SR 242 south (Henryville Road) – Lawrenceburg	Northern terminus of SR 242
			Bridge over the Buffalo River
Summertown			SR 20 west – Hohenwald	Southern end of SR 20 concurrency
			SR 20 east	Northern end of SR 20 concurrency
	17.2	27.7	US 43 (Andrew Jackson Highway/SR 6) – Lawrenceburg, Ethridge, Mount Pleasant, Columbia	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus