QJ may refer to:
QJ, a defunct line on the New York City Subway, now called the J-Z (New York City Subway service),
QJ, a UHF band frequency - see IMTS Frequencies,
China Railways QJ, a Chinese 2-10-2 steam locomotive,
Quarterly Journal of Economics,
Quarterly Journal of Austrian Economics,
ATCvet code QJ Antiinfectives for systemic use, a section of the Anatomical Therapeutic Chemical Classification System for veterinary medicinal products,
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