Charles Armand de Gontaut, 2nd Duke of Biron (5 August 1663 – 23 July 1756), great-grandson of Armand de Gontaut-Biron, was a French military leader who served with distinction under Louis XIV and Louis XV, and was made a Marshal of France by the latter.

He commanded the French vanguard at the Battle of Oudenaarde (1708), and noticed the first manoeuvre of deviation by Marlborough.

Nevertheless, opposed on his lines by numerical superior forces, he was unable to change the course of events that were to happen.

All his grandchildren and 24 great-grandchildren were born in his lifetime.

This biographical article related to the French military is a stub.