Aimé Casimir Marie Picquet, chevalier du Boisguy, sometimes spelt Bois-Guy, (15 March 1776[3] – 25 October 1839[4]), was a Breton chouan general during the French Revolution.

Still a child at the outbreak of the Revolution, he signalled his precocity to fight on the Royalist side, joining the Breton Association at 15 and becoming aide de camp to La Rouërie.

[6] At 17 he was made leader of the chouannerie in the pays de Fougères, and a general at 19.

Boisguy made the north-east of the Ille-et-Vilaine one of the most active areas of the Breton chouannerie, and showed himself an excellent tactician.

In both 1796 and 1800, Boisguy was the last general to surrender, making him one of the main figures of the chouannerie.