| Mirza Ulugh Tahir | |
| Birth Date: | 1830 |
| Birth Place: | Delhi, Mughal Kingdom, India |
| Death Date: | 13 October 1857 (aged 27) |
| Death Place: | Delhi, Mughal Kingdom, India |
| Death Cause: | Execution |
| Mother: | Karim-un-Nisa Begum |
| Father: | Bahadur Shah II |
Shahzada Mirza Ulugh Tahir Bahadur (1830 – 13 October 1857), also known as Mirza Mehdi Sahib, was a son of the Mughal emperor Bahadur Shah II and Karim un-nisa Khanum. He was killed (executed) at Delhi, 13 October 1857 after the Indian Rebellion of 1857 led by his father failed.