J6, J06, J 6 or J-6 may refer to:

• ATC code J06 Immune sera and immunoglobulins, a subgroup of the Anatomical Therapeutic Chemical Classification System
• MGWR Class J6, a Midland Great Western Railway Irish steam locomotive
• Junkers J 6, a German Junkers aircraft
• Shenyang J-6, Chinese version of the Soviet MiG-19 jet fighter
• Joint Staff J-6, A directorate for C4 under the US Department of Defense

and also:

• The International Telecommunications Union callsign prefix for St. Lucia
• Aerolimousine
• J06: acute upper respiratory infections of multiple and unspecified sites ICD-10 code

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