| Honorific-Prefix: | Sayyid |
| Hadi al-Mahdi | |
| Birth Date: | 1918 |
| Death Date: | 1971 (aged 53) |
| Citizenship: | Sudanese |
| Nationality: | Sudanese Arab |
| Party: | Umma Party |
| Relations: | Abd al-Mahdi (father) Bakhita Mustafa (mother) |
Sayyid Hadi Abdulrahman al-Mahdi (1918–1971) was a Sudanese political and religious figure. He was a leader of the Sudanese Ansar religious order and was also the uncle of fellow Umma party politician Sadiq al-Mahdi. The Umma party was largely torn in half between 1966 and 1969 as a result of a split between Hadi al-Mahdi and Sadiq al-Mahdi.
Mahdi died in 1971 whilst attempting to escape from Sudan to Ethiopia following the bombing of Aba Island by Gaafar Nimeiry.[1]