Viaduc d'Austerlitz (English: Austerlitz Viaduct) is a single-deck, steel arch, rail bridge that crosses the Seine in Paris.

It links Gare d'Austerlitz on the Rive Gauche to Quai de la Rapée on the other side of the river.

Therefore, in 1903, engineer Louis Biette, with the help of Fulgence Bienvenüe, conceptualized a metallic bridge that crossed the river in a single span.

The viaduct consists of two reversed steel parabolic arcs joined together at three locations—two near the river banks and one exactly on the top of the arcs—and a single suspended deck about 8.5 m in width and hovering 11 m above water.

Therefore, to circumvent this problem, instead of a straight exit leading out from the main bridge (like the one on the left bank), a curved structure was erected with riveted girders parallel to the rails.