Puig de Sant Cristau, Mountain summit in Albères massif, Pyrénées-Orientales, France.

Puig de Sant Cristau rises to 1,015 m at the eastern end of the Pyrenees, in the Albères massif above Saint-Jean d'Albère, Montesquieu-des-Albères and Villelongue-dels-Monts. Its summit shows three rocky peaks of pale tan and beige gneiss above dark green scrub, the central peak being the highest. The top holds the remains of the Torre de Sant Cristau and the chapel of Sant Cristau de Montesquiu.

On 30 April and 1 May 1794, during the War of the Roussillon, French troops under generals Augereau and Dugommier faced the Spanish camp at Le Boulou; the battle of Le Boulou, begun on 12 floréal an II, pushed the Spanish back and freed French territory. Powder magazines cut into the rock remain from that fighting. A ruined castle or tower at the summit is dated by some to the 12th century.

At the summit stand the chapel of Sant Cristau de Montesquiu, which keeps a livre d'or for visitors to sign, and the remains of the Torre de Sant Cristau, a tower or castle dated by some to the 12th century. The name honours Saint Christopher, and the summit is a regular stop on hiking routes of the Serra de l'Albera.

The trail is well marked and the climb takes several hours, making sturdy footwear important for the hike. Weather at elevation can change quickly, so bringing layers and wind protection is advisable.

The summit holds the remains of the Torre de Sant Cristau, a tower or castle dated by some to the 12th century, though opinions differ on whether it was a castle or a simple watchtower like those of Massane and Madeloc. The rocky top is also a climbing site developed by François Herbert and Jean Gaillarde in the early 1980s, on sculpted gneiss often covered with lichens in several colours.