Monchy-sur-Eu is a commune in the Seine-Maritime department in the Normandy region in northern France.

A forestry and farming village situated in the Pays de Bray, some 20 miles (32 km) northeast of Dieppe at the junction of the D126 and the D58 roads.

The arms of Monchy-sur-Eu are blazoned : Argent, within a square voided tenné, a trefoil, all within a bordure vert. (tenné may not be a 'proper' tincture but it's the closest that English heraldry has to orange.)

Historical population

Year	Pop.	±% p.a.
1968	431	—
1975	398	−1.13%
1982	431	+1.14%
1990	478	+1.30%
1999	492	+0.32%
2007	544	+1.26%
2012	584	+1.43%
2017	587	+0.10%
Source: INSEE

• The church of St. Riquier, dating from the seventeenth century.

• Communes of the Seine-Maritime department