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FEI or Fei may refer to one of the following:
- FEI Company, a supplier of electron microscopy tools
- Fei (letter) or פ, a letter in the in the Hebrew alphabet
- Fei (surname), a common Chinese surname
- Free Enterprise Institute, a Burkean conservative think tank in Houston, Texas
- International Federation for Equestrian Sports (Fédération Équestre Internationale), an international governing body of horse sports
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