Val-de-Marne (French pronunciation: [val.də.maʁn]) is a French department, named after the Marne River, located in the Île-de-France region. The department is situated to the southeast of the city of Paris.

Val-de-Marne is, together with Seine-Saint-Denis and Hauts-de-Seine, one of three small departments in Île-de-France that form a ring around Paris, known as the Petite Couronne (i.e. "inner ring").

Val-de-Marne is made up of 3 departmental arrondissements and 47 communes:

Val-de-Marne was created in January 1968, through the implementation of a law passed in July 1964. Positioned to the south-east of the Paris ring road (and the line of the old city walls), it was formed from the southern-eastern part of the (previously much larger) Seine department, together with a small portion taken from the broken-up department of Seine-et-Oise.

Saint Maurice (also Moritz, Morris, or Mauritius) was the leader of the legendary Roman Theban Legion in the 3rd century, and one of the favorite and most widely venerated saints of that group. He was the patron saint of several professions, locales, and kingdoms. He is also a highly revered saint in the Coptic Orthodox Church.

According to the hagiographical material, the legion, entirely composed of Christians, had been called from Thebes in Egypt to Gaul to assist Maximian to defeat a revolt by the bagaudae. However, when Maximian ordered them to harass some local Christians, they refused and Maximian ordered the unit punished. Every tenth soldier was killed, a military punishment known as decimation. More orders followed, they still refused, partly because of Maurice's encouragement, and a second decimation was ordered. In response to their refusal to use violence against fellow Christians, Maximian ordered all the remaining members of the 6,666 unit executed. The place in Switzerland where this occurred, known as Agaunum, is now Saint Maurice-en-Valais, site of the Abbey of Saint Maurice-en-Valais.