Fiesch is a municipality in the district of Goms in the canton of Valais in Switzerland . Nearby Fiescheralp is administered by Fiesch and is accessible by the Eggishorn lift.

It has been designated a UNESCO World Heritage site for its view of the Jungfrau-Aletsch Protected Area.

Fiesch is first mentioned in 1203 as "Vios". In 1438 it is recorded as "Viesch", and has been known as Fiesch since 1905.

The Fiesch derailment occurred in 2010.