Belgian frigate Louise-Marie

Louise-Marie (F931) is a Karel Doorman-class frigate of the Marine 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 22 December 2005. It was originally commissioned in 1991 in the Netherlands, where it served as HNLMS Willem van der Zaan (F829).

Service
HNLMS Willem van der Zaan was rechristened Louise-Marie (F931) on 8 April 2008 in Antwerp by Queen Paola of Belgium. It was named after Louise-Marie, a naval vessel purchased by the Belgian navy in 1840, which in turn was named after Queen Louise-Marie of Belgium, the wife of Leopold I.

Missions
In September 2010, Louise-Marie was reported to be preparing for a second deployment to the Horn of Africa.

On 29 November 2013, the ship arrived in London, UK as part of the preparations for the centenary of the start of World War I delivering soil from 70 World War I battlefields collected by British and Belgian schoolchildren for the Flanders Fields Memorial Garden in London's Wellington Barracks.

On January 19, 2024, it was announced the Louise-Marie was being sent to the Red Sea to aid in the EU-led Operation Aspides to protect naval shipping in response to a rise in Houthi attacks on commercial vessels near the coast of Yemen. Scheduled to transit the Suez Canal on April 12, deployment indefinitely postponed due to failed operational and technical tests while transiting the Mediterranean Sea, including an incident where a RIM-7 Sea Sparrow missile was reportedly "stuck" in its launch tube. On 27 April, the issues were resolved and Louise-Marie set course for the area of operations.