Merck-Saint-Liévin (French pronunciation: [mɛʁk sɛ̃ ljevɛ̃]; Picard: Merck-Saint-Lévin; West Flemish: Sint-Lievens-Merk) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France[3] about 10 miles (16 km) southwest of Saint-Omer.

The river Aa flows through the village.

The Chemin de fer d'Anvin à Calais opened a railway station at Merck-Saint-Lièvin in 1881.

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