Frans Molenaar (born 1940, Amsterdam) is a Dutch fashion designer.
He studied to become a tailor in Amsterdam from 1955–1958. After his studies he did an internship with Charles Montaigne in Paris from 1959–1960 and worked for Gerard Pipart at Nina Ricci also in Paris from 1961–1964.
In 1967 he started his own business "Frans Molenaar Couture" and he worked as an haute couture designer since.
He initiated the fashion award Frans Molenaar prijs in 1995.