FRJ

FRJ may refer to:

• Federal Republic of Yugoslavia (Serbian: {{lang|sr|Savezna Republika Jugoslavija}}), 1992–2003
• Formula Regional Japanese Championship (FRJ championship), a Formula 3 regional racing league
• Afrijet Airlines, a defunct Nigerian airline, by ICAO airline code
• Frejus Airport, a former airport in France, by IATA airport code