FRG

FRG may refer to:

• Family Readiness Group in the United States Army
• Germany (the Federal Republic of Germany, 1990–present)
• West Germany (the Federal Republic of Germany, 1949–1990)
• 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