Mont Blanc du Tacul, Alpine summit in Haute-Savoie, France.

Mont Blanc du Tacul is an Alpine summit within the Mont Blanc massif reaching 4,248 meters (13,930 feet) and displaying steep granite faces with permanent snow fields on its northern slopes. The mountain features demanding climbing sections that require technical skill and experience.

Mont Blanc du Tacul was officially first climbed on 8 August 1855 by a guideless party including Charles Hudson, Edward Shirley Kennedy, Edward John Stevenson, Christopher and James Grenville Smith, Charles Ainslie and G. C. Joad. They had left Courmayeur on 7 August, crossed the col du Géant and bivouacked below the Aiguille du Midi, then climbed the snow slope, measured at 52°, before abandoning the attempt on Mont Blanc because of the weather. Courmayeur guides may already have reached the summit during attempts of 1854 and 1855.

The mountain serves as a training ground for mountaineers preparing to tackle Mont Blanc, marking an important step in their climbing progression.

Climbers typically begin their ascent from the Aiguille du Midi station, following routes through technical sections marked by fixed ropes. Good physical fitness and previous climbing experience are needed to proceed safely.

The granite pyramids on the east flank—Grand Capucin, Petit Capucin, Pointe Adolphe Rey, Trident du Tacul and Pyramide du Tacul—are separate rock towers below the summit, not part of the summit ridge itself. The mountain's rock is Mont Blanc granite, a hard plutonic stone that forms the vertical pillars of the east face.