| Author | Titles | | 1.
| Leonhard, Rudolf | 1 | | 2.
| Leoni, Carlos António, fl. ca. 1745-1774 | 1 | | 3.
| Leoni, Francisco Evaristo, 1804-1874 | 3 | | 4.
| Leoni, G. D. | 1 | | 5.
| Leoni, Giovanni | 14 | | 6.
| Leoni, James | 1 | | 7.
| Leoni, José Maria Martins | 1 | | 8.
| Leoni, Leo | 1 | | 9.
| Leoni, Leone, 1509-1590 | 2 | | 10.
| Leoni, Pompeo, 1533-1608 | 2 |
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