The French (Reformed) Church of Friedrichstadt (French: Temple de la Friedrichstadt, German: Französische Friedrichstadtkirche, and commonly known as Französischer Dom, meaning 'French cathedral') is in Berlin at the Gendarmenmarkt, across the Konzerthaus and the German Cathedral.
Despite their names, neither of the churches on Gendarmenmarkt is a cathedral, as neither was ever seat of a bishop; instead, the name element Dom ("cathedral" in German) refers to the French word "dôme" (dome/cupola), using terminology as a relic of francophone Frederick the Great, who was instrumental in enhancing Gendarmenmarkt.
Louis Cayart and Abraham Quesnay built the first parts of the French Church between 1701 and 1705 for the Huguenot (Calvinist) community.
The Deutscher Dom, however, on the other side of Gendarmenmarkt, consists of church building and tower as an entity.
The public observation deck of the domed tower offers a panoramic view of the downtown area.