Ponthieu ([pɔ̃.tjø], Latin: Pagus Pontivi, Picard: Ponthiu) was one of six feudal counties that eventually merged to become part of the Province of Picardy, in northern France.

[5] In 1067 the chaplain of Matilda of Flanders, Guy, Bishop of Amiens, composed Carmen de Hastingae Proelio, a Latin poem on the battle of Hastings.

In 1372 an English army under the leadership of Robert Knolles invaded Ponthieu, burning the city of Le Crotoy before crossing the Somme at the ford of Blanchetaque.

Also during the Hundred Years' War, in the Treaty of Arras (1435), Charles VII of France bribed Philip the Good, Duke of Burgundy, to break his alliance with the English in exchange for possession of Ponthieu.

Renaissance Ponthieu, specifically Abbeville, is the setting for the 1993 film The Hour of the Pig, which was released in the US as The Advocate and stars Colin Firth.