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FRG may refer to:

  • Family Readiness Group in the United States Army
  • Federal Republic of Germany
    • West Germany
  • FMN reductase (NAD(P)H)
  • Friendship Radiosport Games
  • Functional renormalization group
  • Guatemalan Republican Front (Spanish: ), a defunct political party in Guatemala
  • Republic Airport in East Farmingdale, New York, United States