| Leonel Mário d'Alva | |
| Office: | Acting President of São Tomé and Príncipe |
| Primeminister: | Daniel Daio |
| Term Start: | 4 March 1991 |
| Term End: | 3 April 1991 |
| Predecessor: | Manuel Pinto da Costa |
| Successor2: | Miguel Trovoada |
| Birth Date: | 22 July 1935 |
| Birth Place: | Overseas Province of São Tomé and Príncipe, Portugal |
| Party: | Democratic Convergence Party |
Leonel Mário d'Alva (born July 22, 1935)[1] is a São Toméan politician. He served as the prime minister of São Tomé and Príncipe[2] from 21 December 1974 until 12 July 1975, when the country gained independence from Portugal.
D'Alva was Minister of Economic Co-ordination from July to December 1975.[3] From late 1975 to 1980, he was President of the São Toméan National Assembly. After the country's first democratic elections in 1991, he was again elected National Assembly President. He also served as foreign minister from 1975 to 1978 and was acting president from 4 March to 3 April 1991.
D'Alva co-founded the Democratic Convergence Party – Reflection Group (PCD–RG) in 1991 and subsequently led it for many years.