JD
- JD – (i) Jack Daniel's (whiskey) – Julian day – Juris Doctor (Latin, "doctor of jurisprudence")
- JDAM – (a/i) Joint Direct Attack Munition ("djay-dam")
- JDBC – (i) Java Data Base Connectivity
- JDCC – (i) UK Joint Doctrine and Concepts Centre, now the Development, Concepts, and Doctrine Centre, DCDC
- JDEM – (i) Joint Dark Energy Mission
- JDK – (i) Java Development Kit
- JDL – (i) Jewish Defense League
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