Pierre-Louis Charles de Failly (21 January 1810 – 15 November 1892) was a French general.

In 1867, he led the French expeditionary corps sent to protect the Papal States with which he defeated Giuseppe Garibaldi at Mentana, this action being the first in which the Chassepot rifle was used.

Failly then commanded the right wing of Marshal de Mac-Mahon's Army of Châlons during the Sedan campaign, and the disastrous outcome of that campaign is partly ascribed to Failly's tactics, though he is certainly no more to blame than the other French generals.

In this battle the French were surprised in their cantonments and driven back upon Mouzon.

The defeat closed the southern escape route and forced the French Army of Châlons towards the Belgian frontier and encirclement at Sedan.