The Leclerc Séries XXI is the third variant of the Leclerc main battle tank family.

It has significant enhancements and improvements over its predecessor, the Leclerc Serie 2. The turret now has a new composite front armour package that includes titanium. Turret bustle composite armour has been replaced with lighter explosive reactive armour. Turret storage bins are also being redesigned to allow for potentially larger add-on armour packages, increasing versatility and adaptability.