The Gründjitobel Viaduct (or Gründjitobel Bridge; German: Gründjitobel-Viadukt) is a single track reinforced concrete railway bridge, spanning the Gründjitobelbach near Langwies, in the Canton of Graubünden, Switzerland. Designed by , it was built between late June 1913 and early July 1914 by Müller, Zeerleder und Gobat, for the Chur–Arosa railway. It is now owned and used by the Rhaetian Railway.