Monte Leone, Mountain summit in the Lepontine Alps, Valais and Verbano-Cusio-Ossola, Switzerland and Italy

Monte Leone is the highest summit of the Lepontine Alps, rising to 3,552 metres on the border between Italy's Piedmont and Switzerland's Valais. Its eastern flank above Alpe Veglia is steep and rocky, while the western side toward Simplon Pass is gentler. The mountain stands at the extreme west of the Lepontine Alps, a few kilometres east of the pass.

The sources document no first-ascent date or climber for Monte Leone; the 1859 Swiss officer claim is unsupported. What they record is the mountain's setting: it rises on the Italy–Switzerland border a few kilometres east of Simplon Pass, at the western end of the Lepontine Alps, and is reached from Varzo, from the pass and from Brig.

The name Leone means "lion" in Italian, said to come from the profile of the mountain's south face. Another proposed origin is Munt d'l'Aiun, local dialect for "Aiun's mountain", after Aione, the village near whose meadows the mountain stands. The lion profile is best seen from the summit of the Seehorn.

The climb requires alpine experience and proper gear, as weather at elevation can change rapidly. The mountain hut serves as a useful stopping point for overnight stays and supplies during multi-day routes.

The name may come from the resemblance of the summit's south face profile to a lion, best seen from the top of the Seehorn. Another explanation traces it to Munt d'l'Aiun, the mountain of the Aiun pastures near Alpe Veglia.