The Splügen Pass (German: Splügenpass; Italian: Passo dello Spluga; Latin: Cunus Aureus) (el. 2,113 m) is a high mountain pass which marks the boundary between the Lepontine and Rhaetian Alps.
It connects the Swiss Hinterrhein valley and Splügen in the canton of Graubünden with the Valle Spluga and Chiavenna in the Italian province of Sondrio, the road continuing to Lake Como. The pass is the water divide between the drainage basins of the Rhine, which flows into the North Sea, and the Po River, which flows into the Adriatic.
Since the construction of the tunnel through San Bernardino, the pass has lost its former importance; it is not kept open in winter.
The Italian equivalent of the Swiss town of Splugen is Montespluga on the Italian side of the pass. Montespluga is a small three street village which is cut off from both Italy and Switzerland during the winter.