Béthencourt-sur-Somme (French pronunciation: [betɑ̃kuʁ syʁ sɔm], literally Béthencourt on Somme; Picard: Bétencourt-su-Sonme) is a commune in the Somme department in Hauts-de-France in northern France.

The commune is situated on the D15 and D62 road junction, on the banks of the river Somme, some 16 miles (26 km) west of Saint-Quentin.

It was here that King Henry V of England found a crossing point over the Somme on 19 October 1415, just days before the Battle of Agincourt.

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