The Albula Tunnel is the centrepiece of the Albula Railway, which forms part of the Rhaetian Railway network, in the Canton of Graubünden, Switzerland. With its maximum elevation of 1,820 m (5,970 ft) above sea level, it is amongst the highest tunnels in the Alps, and has a mountain overlay of up to 950 m (3,120 ft). The tunnel has a length of 5,865 m (3.644 mi). It opened for traffic in 1903.

The Albula railway line is a single track metre gauge railway line forming part of the core network of the Rhaetian Railway (RhB), in the canton of Graubünden, Switzerland. It links Thusis on the Hinterrhein at 697 m (2,287 ft) and Filisur at 1,080 m (3,540 ft) with the spa resort of St. Moritz in Engadine at 1,774 m (5,820 ft).