Vieux Chaillol, Alpine summit in Écrins National Park, France

Vieux Chaillol is a 3,163-metre summit in the Écrins massif, on the border between Champoléon and La Motte-en-Champsaur in the Hautes-Alpes, inside Écrins National Park. Its upper slopes are snow-covered, with dark rock breaking through along the crest and steep gullies; lower down, bare rock, scree and scattered snow patches give way to slopes above the Champsaur valley.

Vieux Chaillol lies within Écrins National Park, created in 1973, and its slopes were long used as summer pastures by herders from Champoléon and La Motte-en-Champsaur. The mountain is also known by its Occitan name, Vièlh Chalhòl. The GR 50 long-distance trail, the Tour du Vieux Chaillol, now circles the massif in five to seven days.

The summit's Occitan name, Vièlh Chalhòl, is still used locally alongside the French form. Walkers on the GR 50, the Tour du Vieux Chaillol, circle the massif in five to seven days, and the canal de Mal-Cros can be seen near the col de la Pisse and the cabane des Parisiens.

Hikers can start from Chaillol 1600 village or Saint-Michel-de-Chaillol, with both routes requiring a full day to reach the summit. The best time to climb is from June through September when the higher paths are snow-free.

The Cabane des Parisiens, at 2,695 metres, is reached from the Col de la Pisse (2,358 m) through alpine pastures and scree, on a trail marked by cairns. Above it the route to the summit has no path, only cairns, and the peak appears only at the last moment. Near the cabane and the col, hikers can see the Mal-Cros canal.