Saint-Martin-le-Gaillard (French pronunciation: [sɛ̃ maʁtɛ̃ lə ɡajaʁ]) is a commune in the Seine-Maritime department in the Normandy region in northern France.

A farming village situated by the banks of the river Yères in the Pays de Caux, at the junction of the D16 and the D113 roads, some 11 miles (18 km) east of Dieppe.

The arms of Saint-Martin-le-Gaillard are blazoned : Azure, on a cross argent between in bend 2 trefoils and in bend sinister 2 eagles Or, a lion gules.

Historical population

Year	Pop.	±% p.a.
1968	285	—
1975	253	−1.69%
1982	270	+0.93%
1990	279	+0.41%
1999	315	+1.36%
2007	329	+0.55%
2012	295	−2.16%
2017	298	+0.20%
Source: INSEE

• The church of Notre-Dame at St. Martin, dating from the thirteenth century.
• The church of St. Sulpice, dating from the sixteenth century.
• The church of St. Ouen at Auberville, dating from the seventeenth century, now a house.
• Ruins of a feudal castle.

• Communes of the Seine-Maritime department