Sainte-Marguerite-sur-Mer (French pronunciation: [sɛ̃t maʁɡəʁit syʁ mɛʁ], literally Sainte-Marguerite on Sea) is a commune in the Seine-Maritime department in the Normandy region in northern France.

A farming and coastal village situated in the Pays de Caux, some 6 miles (9.7 km) west of Dieppe at the junction of the D75 and the D323 roads. Huge chalk cliffs rise up from a pebble beach overlooking the English Channel, to form the northern border of the commune.

The arms of Sainte-Marguerite-sur-Mer are blazoned : Argent, the inscription (in two lines) "Ste. Marguerite/sur Mer" and in base a bar gemel wavy azure, and on a chief wavy gules 5 marguerite daisies slipped and leaved of the field 2 & 3.

Historical population

Year	Pop.	±% p.a.
1968	249	—
1975	306	+2.99%
1982	465	+6.16%
1990	506	+1.06%
1999	502	−0.09%
2007	499	−0.07%
2012	496	−0.12%
2017	477	−0.78%
Source: INSEE

• The Vastérival gardens.
• The church of St. Marguerite, dating from the eleventh century.
• The sixteenth-century château de la Tour and its dovecote.
• A donjon.
• The lighthouse, rebuilt in 1955.

• Communes of the Seine-Maritime department

• Official website (in French)
• Webcam of Sainte Marguerite sur Mer