| Country: | IND |
| Type: | NH |
| Route: | 81 |
| Length Km: | 321.4 |
| Map Custom: | yes |
| Map Notes: | Map of the National Highway in red |
| Direction A: | West |
| Terminus A: | Coimbatore |
| Destinations: | Kangeyam, Karur, Kulithalai, Tiruchirappalli, Jayankondam, Kattumannar koil |
| Direction B: | East |
| Terminus B: | Chidambaram |
| States: | Tamil Nadu 321.4km (199.7miles) |
| Previous Type: | NH |
| Next Type: | NH |
| Previous Route: | 544 |
| Next Route: | 32 |
National Highway 81, commonly referred to as NH 81, is a highway connecting the city of Coimbatore to Chidambaram in South India.[1] This highway was previously part of old national highways 67 and 227 but subsequent to rationalisation of national highway numbers of India by Gazette notification on 5 March 2010 it was changed to National Highway 81.[2] This national highway is 321.4km (199.7miles) long and runs entirely in the Indian state of Tamil Nadu.[3]
| 81 | 321.4 |
Terminal near Coimbatore.
near Avinashipalayam (Kangeyam)
near Vellakoil (Kangeyam)
near Karur
near Tiruchirappalli
near Paluvur(Keezhapalur)
near Gangaikonda Cholapuram
Terminal near Chidambaram.