| Country: | IND |
| Type: | NH |
| Route: | 46 |
| Image Notes: | Old NH 46 near Vellore |
| Length Km: | 148 |
| Map Custom: | yes |
| Direction A: | West |
| Terminus A: | Krishnagiri, Tamil Nadu |
| Direction B: | East |
| Terminus B: | Walajapet, Vellore district, Tamil Nadu |
| Destinations: | Vaniyambadi - Ambur - Vellore - Arcot |
| States: | Tamil Nadu 148km (92miles) |
| Previous Type: | NH |
| Previous Route: | 45C |
| Next Type: | NH |
| Next Route: | 47 |
National Highway 46 was a national highway in the Indian state of Tamil Nadu. It ran from Krishnagiri to Walajapet in the state.[1] It passed through Vellore and it was a highly important connecting road for vehicles travelling between Chennai and Bangalore. The total Length of NH 46 was 148km (92miles). The Krishnagiri-Walajapet section is being upgraded to six lanes by L&T on a build-operate-transfer basis.[2]
Old national highway 46 has been renumbered as National Highway 48, which runs from Delhi to Chennai via Mumbai and Bangalore.[3]
Krishnagiri, Bargur, Nattrampalli, Vaniyambadi, Ambur, Pallikonda, Vellore, Arcot, Ranipet and Walajapet.[4]