Charles Gaspard Élisabeth Joseph de Bailly, marquis de Bailly (French pronunciation: [ʃaʁl ɡaspaʁ elizabɛt ʒozɛf də baji]; 6 January 1765, Le Bourgneuf-la-Forêt, Mayenne - 14 January 1850, Le Bourgneuf-la-Forêt) was a French army officer.
He entered the army as sub-lieutenant in the King's Infantry Regiment (régiment d'infanterie du roi) in 1780 and on 28 August 1790 found himself caught up in the Nancy affair (he was one of the 16 officers to defend General Malseigne against the mutineers), in which he was wounded.
He refused all Napoleon I's offers of a job in his army, he became the king's most devoted and trusted servant on the Bourbon Restoration, as president of the Conseil général de la Mayenne, maréchal de camp (from 18 April 1816) and inspector of the department's national guards (Gardes nationales), and as deputy in 1815 and 1824.
A fervent royalist, he was elected to the Chambre introuvable by the college of the Mayenne department on 22 August 1815 - he was part of the majority party in it.
He became a commander of the order of Saint Louis on 23 May 1825 and died at the château de Fresnay in Mayenne on 14 January 1850.