Service D was a small group of the Belgian resistance during the Second World War which operated chiefly in the provinces of Luxembourg, Liège and Limburg.

The "D" in the group's name is said to have stood for the activities which the group was involved in: the fight against "Defeatism" and "Denunciation" as well as the "Demoralization" of the Germans.

[1] Service D was founded in July 1940 in Liège by Joseph Joset.

[1] One of the group's members even served as a telephonist at a Gestapo headquarters.

A subsection of the group, known as Équipe Z was involved in sabotage.