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