Guilmécourt 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 situated in the Pays de Caux, some 11 miles (18 km) northeast of Dieppe at the junction of the D222, D117 and the D454 roads.

The arms of Guilmécourt are blazoned : Quarterly 1: argent, a mallet vert; 2&3 Azure étincelé, a lion argent; 4: argent, a pinecone vert. (étincelé is an obscure semy of 'sparks' often tiny 'stars' as here)

Historical population of Guilmécourt

Year	1962	1968	1975	1982	1990	1999	2006
Population	166	185	185	245	240	241	261
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 St. Waast, dating from the thirteenth century.
• A sixteenth-century stone cross.
• A feudal motte.

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  Guilmécourt church
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  Guilmécourt under snow
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  A field of flax
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  Harvest time
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  Oil-seed rape fields
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  Wheatfields
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  The countryside
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  Sheep
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  The countryside
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  Guilmécourt at night
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  Flower of the flax
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  A field of cut flax

• Communes of the Seine-Maritime department