The Rheinwaldhorn (Italian: Adula) is the highest point in the Swiss canton of Ticino at 3,402 metres above sea level. It lies on the border between the cantons of Graubünden and Ticino, in the Adula massif, part of the St. Gotthard massif of the Adula Alps in southern Switzerland .

The mountain is known by different names, in German as Rheinwaldhorn or Adulahorn, in Italian as l'Adula or Piz Valrhein, in Romansh as Piz Valragn. The group of the snowy peaks lying between the two principal branches of the Rhine were known in the Middle Ages by the names Mons Aquila or Mons Avium. From the Romansh form of the first comes the name Adula, which is used to designate the north-eastern portion of the Lepontine Alps .