Saint-Souplet (French pronunciation: [sɛ̃ suplɛ]) is a commune in the Nord department in northern France.

Located in the south of Cateau-Cambrésis and on the doorstep of Avesnois, Saint-Souplet is surrounded by the nature landscapes of Hainaut : grasslands bordered by 'bocage' hedges and vast expanses of cultivated fields.

It extends along the Selle, a tributary river of the Scheldt, which arises in Aisne and winds some 50 kilomètres through Nord.

Saint-Souplet owes its name to its patron saint, Sulpitius the Pious, archbishop of Bourges in the 7th century.

[4] These arms are those of D'Anneux, marquis of Wargnies and lords of Saint-Souplet.