FRG

FRG may refer to:

• Family Readiness Group in the United States Army (formerly known as the Family Support Group or FSG)
• Federal Republic of Germany, the official name of Germany since 1949, though mainly used for West Germany from 1949 to 1990
• Friendship Radiosport Games, a multi-sport event that has been held since 1989
• Functional renormalization group, a method in theoretical physics
• Guatemalan Republican Front (Spanish initials), a right-wing political party in Guatemala
• IATA code of Republic Airport in East Farmingdale, New York, United States
• FMN reductase (NAD(P)H), an enzyme