MRX may refer to:
The ABCG2 gene MRX complex, DNA damage repair complex in yeast The Magnetic Reconnection eXperiment led by DoE's Princeton Plasma Physics Laboratory Mahshahr Airport, Iran, by IATA airport code Philips HeartStart MRx cardiac monitor/defibrillator Proposed pressurized water reactor for ship propulsion developed by the Japan Atomic Energy Research Institute (JAERI) Hashtag for Market research