Volcán Marmolejo is a 6,108 m (20,039 ft) high Pleistocene stratovolcano in the Andes on the border between Argentina and Chile.

[5] It is located 9 km (6 mi) NNE of the active San José volcano, and is the southernmost 6,000 m (19,685 ft)-plus peak in the world.

[6][7] The Argentine portion is within the Argentinean protection area of Provincial Reserve for Multiple Use and Natural Recreation Manzano / Portillo de Piuquenes.

[6][7] Marmolejo was first climbed by Hermann Sattler, Sebastian Krückel and Albrecht Maass (Germany) October 1, 1928.

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