Leendert is a Dutch given name. Notable people with this name include:
Leendert van Beijeren (1619–1649), Dutch painter
Leendert Bosch (1924–2017), Dutch biochemist
Leen Buis (1906–1986), Dutch road cyclist, given name Leendert
Leendert van der Cooghen (1632–1681), Dutch painter
Leendert van Dis (born 1944), Dutch rower
Leendert Antonie Donker (1899–1956), Dutch politician
Leendert Ginjaar (1928–2003), Dutch politician
Leendert Hasenbosch (c. 1695–c.1725), Dutch castaway
Leendert Konijn (1899–1977), Dutch entrepreneur in Dutch East Indies
Leendert de Koningh (1777–1849), Dutch painter
Leendert de Lange (born 1972), Dutch politician
Leendert van der Meulen (born 1937), Dutch cyclist
Leendert Pieter de Neufville (1729–1797), Dutch banker
Leendert Saarloos (1884–1969), Dutch dog breeder
Leendert Viervant the Younger (1752–1801), Dutch architect and cabinet builder
Leendert van der Vlugt (1894–1936), Dutch architect