Molenaar is a Dutch surname deriving from the Dutch word for "miller".
Molenaar is the surname of:
Beau Molenaar (born 1985), Dutch football goalkeeper
Cees Molenaar (1928–1979), founder of the football club AZ
Dee Molenaar (1918–2020), American mountaineer, author and artist
Frans Molenaar (1940–2015), Dutch fashion designer
Hillie Molenaar (born 1945), Dutch documentary film director
Jan Molenaar (1958–2009), perpetrator of the Napier shootings in New Zealand
Keje Molenaar (born 1958), Dutch footballer
Klaas Molenaar (1921–1996), founder of the football club AZ
Marjolijn Molenaar (born 1983), Dutch cricketer
Peter Molenaar (born 1946), Dutch psychologist
Robert Molenaar (born 1969), Dutch footballer
Tim Molenaar (born 1981), New Zealand rugby player
Willem Molenaar (1945–2022), Dutch cricket umpire
Moolenaar is the surname of: