Erny-Saint-Julien (French pronunciation: [ɛʁni sɛ̃ ʒyljɛ̃]; Picard: Arny-Saint-Julien; West Flemish: Erni) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France.

[3] A farming village situated 15 km (9.3 mi) southeast of Saint-Omer, at the D158 and D193 crossroads.

It is surrounded by the communes Bomy, Enquin-les-Mines and Fléchin.

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