Emperor towers or Kaiser towers (German: Kaisertürme or Kaiserwarten) are monuments that were built up to 1918 in honour of the German emperors William I, Frederick III and Wilhelm II in the German Empire or for Emperor Franz Josef in Austria-Hungary.

The construction of these towers was also intended to counter the so-called Bismarck cult which had resulted, for example, in the erection of hundreds of Bismarck towers and columns.

• Kaiser Tower on the Neunkircher Höhe in the Odenwald
• Kaiser Tower (Wernigerode) on the Armeleuteberg near Wernigerode
• Kaiser Tower on the Steinberg near Goslar
• Kaiser Tower in Quedlinburg, since converted into a residence
• Kaiser Tower in Hirschberg (Riesengebirge)
• Kaiser Tower near Leutenberg in Thuringia
• Kaiserwarte near Blankenburg (Harz), renamed the Wilhelm Raabe Tower

• Kaiser Tower on the Nollendorfer Höhe, after 1918 renamed the Karl Weis Tower (Karl-Weis-Warte), later demolished

• Kaiser William Tower
• Kaiser William monument