Église Notre-Dame de Portbail, Romanesque church in Port-Bail-sur-Mer, France.

Église Notre-Dame de Portbail is a Romanesque church with a single nave and a fortified bell tower crowned by a crenellated walkway on corbelled false machicolations, topped with a pyramidal stone spire. Its walls show herringbone masonry and a 15th-century south porch. The tower, with a small cross at its peak, stands beside the harbor.

Port-Bail appears in Saint-Wandrille abbey charters of 670-687, and a monastery there was destroyed by the Normans in 856. A donation of 1026 names Notre-Dame as the centre of the "territory of the abbey" of Port Bahil. Before the end of the 11th century Anquetil de Claids and his son Robert gave the church to the Benedictine abbey of Lessay, making it a priory, deserted in the second half of the 13th century. It remained a parish church until 1909 and was classified as a monument historique on 10 July 1968.

On the north wall inside the chapel, a painted fragment of a litre funéraire shows the arms of the Hellouin family: azure with a gold chevron, three gold stars above and a silver spearhead below. The Hellouin held the honorary patronage through their fief of Lanquetot and were ennobled by letters registered in 1640.

The church stands at the edge of the Portbail haven, next to the thirteen-arch bridge and the early Christian baptistery, so the two monuments can be seen on one walk. It opens as an exhibition space from April to September; outside those months the building is closed to visitors.

The tower's crenellated walkway rests on false machicolations with arcading, and the whole tower was painted white in early 20th-century photographs. It served as a watchtower and defensive post, and today guides boats into the harbour.