Leonardus (name)
Leonardus is a Latinized version of the Germanic masculine name Leonard. Leonardus has been a relatively common birth name in the Netherlands, though most people use a short form in daily life, like Leen, Leendert, Lennaert, Lennard, Lennart, Lennert, Lennie, Leo, Leon, Leonard and Lon.
;Latinized name
- Sanctus Leonardus, Frankish noble, abbot and Christian saint
- Leonardus Achates, Swiss printer in Italy
- Leonardus Bruni Aretinus, Italian humanist, historian and statesman
- Leonardus Lessius, Flemish Jesuit theologian
- Leonardus Roselli, Italian bishop
- Leonardus Vincius, Leonardo da Vinci
- Leonardus Petrus "Leo" Beukeboom, Dutch sign painter and lettering artist
- Leonardus L.J. "Leo" de Bever, Dutch architect
- Leonardus Bramer, Dutch painter
- , Dutch bishop in Ethiopia
- Leonardus "Léon" Dolmans, Belgian footballer
- Petrus Leonardus "Leo" Ehlen, Dutch footballer
- Leonardus J.P.M. "Léon" Frissen, Dutch Queen's Commissioner of Limburg
- Leonardus Eustachius "Leen" Jansen, Dutch boxer
- Leonardus F.E. "Leon" Kantelberg, Dutch footballer
- Leonardus Gerardus Kortenhorst, Dutch President of the House of Representatives
- Leonardus van der Laan, Dutch architect
- Leonardus Antonius Lightenvelt, Dutch Minister of Justice and Foreign Affairs
- Jan Leonardus "Lennie" Louw, South African-born Namibian cricketer
- Leonardus Benjamin Moerdani, Indonesian general and Minister of Defense
- Leonardus Nardus, Dutch fencer
- , German-born Dutch librarian and university president
- Leonardus J.H. “Leo” Passage, Dutch-born American hairstylist, educator, innovator and philanthropist
- Leonardus P.P. "Lon" Pennock, Dutch sculptor, monumental artist and photographer
- Leonardus Syttin, Lithuanian sport shooter
- Leonardus Cornelius van der Valck, Dutch diplomat and mysterious count in Germany
- Leonardus Q.M. "Leo" van Vliet, Dutch road racing cyclist
- , Dutch politician of the Batavian Republic