QJ may refer to:
- QJ (New York City Subway service), a defunct rapid transit service (1960–1973)
- ATCvet code QJ (Antiinfectives for systemic use), a veterinary medication class
- China Railways QJ, a Chinese steam rail locomotive class (built 1956–1988)
- Quarterly Journal of Austrian Economics, since 1998, by the Mises Institute
- Quarterly Journal of Economics, since 1886, by Harvard University
- QJ, a UHF IMTS radio frequency
This disambiguation page lists articles associated with the title QJ.
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