The Avre (French pronunciation: [avʁ]) is a river in Picardy, France, and is the principal tributary, from the left side, of the River Somme.

At 66 kilometres (41 mi) long,[1] it drains a relatively important basin of 1,150 km² but only flows at best 5,1 m³/s near its confluence at Longueau.

[2] Its principal tributaries are: the Noye, joining at Boves, the Trois Doms joining at Pierrepont-sur-Avre, the Brache joining at Braches and the Luce at Berteaucourt-les-Thennes.

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