J23, J 23, J.23 or J-23 may refer to:
- Agent J-23, the code name for Hans Kloss, the fictional World War II secret agent appearing in the 18-episode 1967–1968 Polish television series Stawka większa niż życie
- Malaysia Federal Route J23, a major road in Johor, Malaysia
- S/2003 J 23, a natural satellite of Jupiter
- Danny K, a studio album
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