Saint-Riquier (French pronunciation: [sɛ̃ ʁikje]; Picard: Saint-Ritchier) is a commune in the Somme department in Hauts-de-France in northern France.

It was enriched by King Dagobert I and prospered in the early 9th century Carolingian Empire under the abbacy of Angilbert, son-in-law of Charlemagne.

Count Enguerrand I placed his sons, Fulk, later abbot of Forest-l'Abbaye, and Guy, later the bishop of Amiens, in Saint Riquier for their education.

The present church, built in the 13th and 14th centuries, is a magnificent example of Flamboyant Gothic architecture, and has a richly sculptured front on the west, surmounted by a square tower.

In 1544 it was burned by the English, an event that marks the beginning of its decline.The bell-tower of Saint-Riquier was inscribed on the UNESCO World Heritage List in 2005 because of its architecture and testimony to the rise of municipal power in the area during the late Middle Ages, Renaissance, and Baroque periods.