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'''J2''', '''J.II''' or '''J-2''' may refer to:
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== Codes and classifications ==
* J2, the IATA airline designator for [[Azerbaijan Airlines]] 
* [[J-2 visa]], a nonimmigrant visa issued by the United States for spouses and dependents of J-1 visa exchange visitors
* [[ATC code J02]], a subgroup of the Anatomical Therapeutic Chemical Classification System
* [[Haplogroup J2 (Y-DNA)]], a Y-DNA haplogroup
* [[Janko group J2]] in mathematics
* [[Jinja2]], a Python template engine that uses file extension <code>.j2</code> 
* <math>J_2 \,</math>, a celestial body's [[second dynamic form factor]]
* <math>J_2 \,</math>, the second invariant of the [[Cauchy_stress_tensor#Invariants_of_the_stress_deviator_tensor|deviatoric stress tensor]]

== People and organizations ==
* [[j2 Global Communications]], a tech company best known for electronic fax services
* [[J2 (music channel)]], a former New Zealand music TV Channel
* TVB J2, former names of [[TVB Plus]], a digital TV channel of [[TVB|Television Broadcasts Limited]]
* [[J. League Division 2]], the second-tier of Japanese professional association football
* [[Jefatura de Inteligencia del Estado Mayor Conjunto de las Fuerzas Armadas]] (J-2), an Argentine intelligence agency
* J2, the [[Joint Chiefs of Staff#Directorates of the Joint Staff|Intelligence Directorate]] of the United States Joint Chiefs of Staff
* [[Director of Military Intelligence (Ireland)|Director of Military Intelligence]], the head of Irish Defence Forces intelligence, sometimes referred to as J2

== Vehicles ==
* [[Rocketdyne J-2]], a rocket engine used in the Saturn rockets and intended for use on the Space Launch System
* [[AEG J.II]], a World War I German ground attack aircraft
* [[Albatros J.II]], a World War I German single-engine, single-seat, biplane ground-attack aircraft
* [[Allard J2 (disambiguation)|Allard J2]], any of several postwar American market-designed English cars
* [[Auster J-2 Arrow]], a 1945 British single-engined two-seat high-wing touring monoplane
* [[HMAS J2]], an Australian submarine
* [[JAC J2]], a city car produced by JAC Motors
* [[Junkers J 2]], a 1916 all-metal German fighter prototype aircraft
* [[LB&SCR J2 class]], a British LB&SCR locomotive
* [[McCulloch J-2]], a 1962 small, two-seat autogyro
* [[MG J-type]], a 2-seat sports car produced by the MG Car company from 1932 to 1934
* [[Morris Commercial J2]] small forward-control van produced from 1956 to 1967
* [[Taylor J-2]], a 1935 American two-seat light aircraft
* [[Mikoyan-Gurevich MiG-15]], an aircraft called J-2 in China

== Other uses ==
* [[J2 (comics)|J2]], a comicbook character, son of Juggernaut
* [[J2 (orca)]], or Granny (c. 1936-1951 – c. 2016), a killer whale
* [[J2 League]], Japanese football league
* [[County Route J2 (California)]]
* [[S/2003 J 2]], a retrograde irregular satellite of Jupiter
* [[J2 (roller coaster)]], or Hell Cat, a roller coaster at Clementon Amusement Park
* [[Johnson solid]] J2, the equilateral [[pentagonal pyramid]]
* [[Rocketdyne J-2]], a cryogenic rocket engine used on Saturn V Moon rocket
* [[Samsung Galaxy J2]], an Android smartphone
* [[Samsung Galaxy J2 Prime]], a successor smartphone, also known as the Samsung Galaxy J2 Ace
* J2, an open-source [[SuperH#J Core|clone of the Hitachi/Renesas SuperH-2 microcontroller]]
* [[J2 coefficient]], representing the oblateness of Earth

== See also ==
* [[JII (disambiguation)]] <!-- because [[J.II]] redirects here -->
* [[2J (disambiguation)]]

{{Letter-Number Combination Disambiguation}}