Joséphine Rebecca Marie Julienne Bertha "Fientje" Moerman (born 19 October 1958) is a Belgian liberal politician and currently a judge on the Constitutional Court of Belgium.

Afterwards she was senior consultant in the European liberal fraction, was specialized in institutional reforms and relations with Israel and the Gulf States (1991–1995).

In 2003, she joined the government Verhofstadt II as Minister of Economy, Energy, Foreign Trade and Science Policy, but in July 2004, she left the Federal Government to become the Flemish Minister of Economy, Enterprises, Innovation, Science and Foreign Trade.

After a negative report around the case by the Flemish ombudsman, on 10 October 2007, Fientje Moerman resigned due to the fallout of the hiring scandal; she was replaced as vice-minister-president by Dirk Van Mechelen and as minister by Patricia Ceysens [nl].

In 2018, Fientje Moerman was appointed by royal decree of 18 March 2018 as a judge on the Constitutional Court of Belgium.