RFX may refer to: Reversed-Field eXperiment, a reversed field pinch nuclear fusion device The collective term for a request for information (RFI), request for proposal (RFP), or request for quotation (RFQ) J P Hunt Air Carriers (ICAO airline code: RFX) aka REFLEX, U.S. airline: see List of airline codes (J) The regulatory factor X (RFX) gene and protein family: RFX1 gene and protein RFX2 gene and protein RFX3 gene and protein RFX4 gene and protein RFX5 gene and protein RFX6 gene and protein