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: {{lang|es|Frente Republicano Guatemalteco}}), a defunct political party in Guatemala
• Republic Airport in East Farmingdale, New York, United States

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