The Tiefencastel derailment occurred near the municipality of Tiefencastel, Switzerland, on 13 August 2014 when a passenger train travelling on the Albula Railway was struck by a landslide and derailed. Ten people were injured, four seriously, and 1 person died.

Tiefencastel is a village and a former municipality in the district of Albula in the canton of Graubünden in Switzerland. On 1 January 2015 the former municipalities of Alvaschein, Mon, Stierva, Tiefencastel, Alvaneu, Brienz/Brinzauls and Surava merged to form the new municipality of Albula/Alvra.