FEI may refer to:
- Financial Executives International (FEI), an American organization for senior-level financial executives
- FEI Company, a supplier of electron microscopy tools
- International Federation for Equestrian Sports or Fédération Équestre Internationale, an international governing body of horse sports
Fei may refer to:
- Fei (letter) or פ, a letter in the Hebrew alphabet
- Fei (surname), a common Chinese surname
- Wang Feifei (王霏霏), stage name Fei, a Chinese singer in South Korean girl group Miss A
- Fei Comodo, a British post-hardcore band
- Fei County, in Shandong, China