Molenaar is a Dutch surname deriving from the Dutch word for "miller".
Molenaar is the surname of:
Beau Molenaar (b. 1985), a Dutch football goalkeeperCees Molenaar (1928-1979), founder of the football club AZDee Molenaar (b. 1918), an American mountaineer, author and artistFrans Molenaar (b. 1940), a Dutch fashion designerHillie Molenaar (b. 1945), a Dutch documentary film directorJan Molenaar (1958-2009), a New Zealand gunman of the 2009 Napier shootingsKeje Molenaar (b. 1958), a Dutch footballerKlaas Molenaar (1921-1996), founder of the football club AZMarjolijn Molenaar (b. 1983), a Dutch cricketerRobert Molenaar (b. 1969), a Dutch footballerTim Molenaar (b. 1981), a New Zealand rugby playerWillem Molenaar (b. 1945), a Dutch cricket umpire