- Gustav Fröhlich as Freder
- Brigitte Helm as Maria and her robot double[a]
- Alfred Abel as Joh Fredersen, the master of Metropolis and Freder's father.
- Rudolf Klein-Rogge as Rotwang, a scientist
- Heinrich George as Grot, the foreman of the Heart Machine
- Fritz Rasp as The Thin Man, Fredersen's spy
- Theodor Loos as Josaphat, Fredersen's assistant
- Erwin Biswanger as Georgy (or 11811), a worker
- Helen von Münchofen as a Lady in the Pleasure Garden
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