IREX can mean:
International Robot Exhibition, a robot trade fair held every two years in Tokyo, Japan iRex Technologies, the company that produced the iLiad and the iRex Digital Reader 1000 ebook devices International Research & Exchanges Board, an international nonprofit organization SS Irex, an 1890 wreck USS Irex, a 1944 submarine S/Y Irex (1884 First Class cutter) Instrument Rating EXamination (for pilots - CASA)