The Canton of Saint-Pol-sur-Ternoise is a canton situated in the Pas-de-Calais département and in the Hauts-de-France region of France.

This canton is centred on the town of Saint-Pol-sur-Ternoise in the arrondissement of Arras.

At the French canton reorganisation which came into effect in March 2015, the canton was expanded from 42 to 87 communes:[2]