Église Saint-Pierre d'Ault, Listed church and historical monument in Ault, France

The église Saint-Pierre d'Ault is a Gothic church in Ault, in the Somme department of the Hauts-de-France region, listed as a historical monument in 1976. Its walls are built in a checkerboard pattern of white stone and flint, typical of the maritime Picardy area. The 14th-century square tower has a flat top with a small watchtower and gargoyles at its four corners.

In 1234 Countess Adèle de Ponthieu and her daughter Aénor founded a castle chapel at Ault. Around 1340-1341 Mathieu de Trie, marshal of France, and his wife Ide de Rosny enlarged it into Saint-Pierre church with a four-bay nave; the charter he granted the town made the tower its belfry. After Louis XI burned Eu on 10 July 1475 and refugees reached Ault, two side aisles were added. The 1579 storm destroyed the lower town, its Notre-Dame church and the harbour, leaving Saint-Pierre as the main church.

The church stands on the Grande Rue in the center of Ault and is easy to reach on foot. Guided tours are offered on Saturday mornings in summer, and the building opens to all during the Journées du Patrimoine weekend.

The 14th-century tower became Ault's belfry after Mathieu de Trie granted the town a communal charter in 1340-1341. Its flat top carries a small watch turret, and gargoyles sit at the four corners. Three bells were hung in 1821: Charlotte, Henriette and Louise.