Elsie Maréchal (21 June 1894 – 25 March 1969) was an English woman who became active in the Belgian Resistance during World War II.

After being betrayed in November 1942, she was sentenced to death and subjected to the 'Nacht und Nebel' policy designed to make such opponents of the Nazis 'disappear' in prison camps.

The Comet Line was formed in 1941 to help Allied airmen who had been shot down over enemy territory evade capture and reach safety by smuggling them through France to neutral Spain.

Few Comet Line helpers were fluent in English, so the two Elsies were invaluable in evaluating the bonafides of a man who claimed to be a downed allied airman.

Working for the leader of the Comet Line in Brussels, Jean Greindl (code name "Nemo"), the older Elsie traveled around Brussels and vicinity to solicit help for the Comet Line from priests, academics and others, and the Maréchals sheltered downed airmen and other fugitives from the Germans in their home.

[4] On November 19, 1942, two men claiming to be American airmen appeared at the door of the Maréchal home, brought there by a Comet Line helper.

This was contrary to the usual practice of the Comet Line and the young Elsie was immediately suspicious as the two didn't appear "American" to her.

A young man, Victor Michiels, sent to the Maréchal home by Nemo to check on them was shot to death by the Gestapo.

The Comet Line nearly collapsed, especially after leaders Andrée de Jongh and Jean Greindl were arrested in January 1943 and February 1943 respectively.

[3] The younger Elsie lived in Rixensart near Waterloo, south of Brussels and died 22 June 2022, a few days after her 96th birthday.