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Sergei, in the works of Harry Turtledove, may refer to:
- Sergei (Black Tulip), fictional Red Army soldier, POV of "Black Tulip".
- Sergey Gorshkov, historical Soviet admiral referenced in Aftershocks.
- Sergei Izvekov, a Russian colonist on Haven in "Hang Together".
- Sergei Morozhin, minor fictional character in Worldwar.
- Sergei Pavlov, fictional Russian ambassador, minor character in The Two Georges.
- Sergei Tolmasov, fictional cosmonaut and POV in A World of Difference.
- Sergei Yaroslavsky, fictional Red Air Force pilot and POV in The War That Came Early.