Belleville-sur-Mer is a former commune in the Seine-Maritime department in the Normandy region in northern France. On 1 January 2016, it was merged into the new commune of Petit-Caux.

A farming village in the Pays de Caux, situated on the coast of the English Channel, some 4 miles (6.4 km) northeast of Dieppe, at the junction of the D113 and D113e roads.

The arms of Belleville-sur-Mer are blazoned : Azure, a saltire between 4 eagle heads contourny argent.

Historical population of Belleville-sur-Mer

Year	1962	1968	1975	1982	1990	1999	2006
Population	169	173	178	174	370	632	818
From the year 1962 on: No double counting—residents of multiple communes (e.g. students and military personnel) are counted only once.

• The church of Notre-Dame, dating from the thirteenth century.

• Communes of the Seine-Maritime department