| Mehrnegar castle | |
| Native Name: | قلعه مهرنگار |
| Native Name Lang: | fa |
| Former Names: | Mehrin (مهرین) |
| Location Town: | Damghan County |
| Location Country: | Iran |
| Building Type: | Castle |
Mehrnegar castle (Persian: قلعه مهرنگار) is a historical castle located in Damghan County in Semnan Province, The longevity of this fortress dates back to the Historical periods after Islam.[1] [2]