The F931 Louise-Marie is a Karel Doorman-class frigate of the Naval Component of the Belgian Armed Forces that was commissioned in 2008. It is the second of the two frigates of this class that were purchased from the Royal Netherlands Navy on December 22, 2005. It served in the Royal Netherlands Navy as the HNLMS Willem van der Zaan (F829). The HNLMS Willem van der Zaan was rechristened as the F931 Louise-Marie on 8 April 2008 in Antwerp by Her Majesty Queen Paola of Belgium. Louise-Marie is under command of commander Carl Gillis.