AJX may refer to:
- AJX Bridge over South Fork and Powder River, Johnson County, Wyoming, USA; an NRHP-listed truss bridge for US 87
- Air Japan (ICAO airline code
AJX) - Alexium International (stock ticker
AJX), Australian materials company - AgJunction Inc. (stock ticker
AJX); see Companies listed on the Toronto Stock Exchange (A) - AFC Ajax (abbreviated
AJX), a soccer club in Amsterdam, Netherlands