Doullens (French pronunciation: [dulɑ̃]; Picard: Dourlin; former Dutch: Dorland) is a commune in the Somme department, Hauts-de-France, France.

Its inhabitants are called Doullennais and Doullennaises.

Doullens is situated on the N25 road, in the northern part of the department, straddling the river Authie, the border with the Pas-de-Calais.

Doullens is practically mid-way on the intersection of these axes : Sites and monuments include: Infinita decus lilia mihi prestant