Fischbach (; ) is a commune and village in central Luxembourg. It is part of the canton of Mersch, which is part of the district of Luxembourg.
, the town of Fischbach, which lies in the centre of the commune, had a population of 444. Other towns within the commune include Angelsberg and Schoos. Fischbach is the site of Fischbach Castle, one of the private residences of the Grand Ducal family.
A proposal to merge the commune with Nommern and Larochette into a new commune named Meesebuerg was put to a referendum in November 2014. Although 66.5% of voters in Larochette were in favour of the merger, 76% and 70% of those in Fischbach and Nommern respectively were against, leading to the abandonment of the project.