Barzy-en-Thiérache (French pronunciation: [baʁzi ɑ̃ tjeʁaʃ], literally Barzy in Thiérache) is a commune in the department of Aisne in the Hauts-de-France region of northern France.

The Route Nationale D1043 from Bergues-sur-Sambre to Le Nouvion-en-Thiérache passes through the southern tip of the commune but does not provide direct access.

[3] The Sambre river runs from east to west through the commune and the village fed by the Ruisseau du Vivier Bare.

Towards the end of the First World War, on 5 November 1918, the advance of French and British troops was stopped in a bloodbath 500 metres from the village (25 soldiers and 2 civilians were killed).

On 6 November, after a violent French bombardment, the 73rd Infantry Regiment and the 59th Algerian Riflemen liberated the commune at 5.30am and released nearly a thousand inhabitants and refugees.