The Reffye 85 mm cannon (French: "Canon de campagne de 7 de Reffye modèle 1870") was a French artillery piece of the 19th century, developed by the French artillery General Jean-Baptiste Verchère de Reffye, superintendent of the works at Meudon.

It was an 85 mm (3.35-inch) rifled breech-loading cannon, equipped with a breech screw, initially made of bronze.

The interrupted screw breech block used for sealing was an advanced feature, but the perfect sealing of the breech would only be achieved two years later with the invention of the de Bange obturator.

Reffye also developed in 1866 a mitrailleuse (named "Canon à balles"), one of the best early machine guns,[3] which was used during the Franco-Prussian War of 1870.

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