| Country: | NPL |
| Type: | H |
| Route: | 12 |
| Alternate Name: | Ratna Highway |
| Image Notes: | Ratna Highway South of Kohalpur |
| Map Custom: | yes |
| Map Notes: | Ratna Highway in red |
| Length Km: | 113.08 |
| Terminus B: | Birendranagar, Nepal |
| Terminus A: | Nepalganj, Nepal |
| Next Type: | H |
| Next Route: | 13 |
| Next Dab: | H13 (Nepal) |
| Previous Type: | H |
| Previous Route: | 11 |
| Previous Dab: | H11 (Nepal) |
Ratna Highway (previously H12) (Nepali: रत्न राजमार्ग ) is now a part of NH58 together with Karnali Highway.
Ratna Highway was a highway in western Nepal that crosses the districts of Banke and Surkhet in a south to north direction.The 113.08 km highway starts at Nepalgunj, where it depicts a continuation of National Highway 927 of India and runs towards the North, where it crosses Mahendra Highway at Kohalpur. The highway continues north and leaves the Terai Plains, crosses Babai River and terminates in Birendranagar, from where Karnali Highway continues northwards.[1] [2]