J4

J4/J04, J-4/J-04 or J.4/J.04 may refer to:

In science and academia

ATC code J04 Antimycobacterials, a subgroup of the Anatomical Therapeutic Chemical Classification System
Janko group J4, in mathematics
S/2003 J 4, a natural satellite of Jupiter
J04 : acute laryngitis and tracheitis ICD-10 code
Square cupola, Johnson Solid number 4

Mikoyan-Gurevich MiG-17, Chinese designation of this Soviet-made aircraft is J-4
HMAS J4, an Australian Royal Navy submarine which saw service during World War I
Junkers J 4, a 1917 German sesquiplane format warplane
J4F was the U.S. Navy's designation for the Grumman Widgeon seaplane.

Airmak J4, an Italian microlight aircraft design
Auster J-4, a 1946 British single-engined two-seat high-wing touring monoplane
Morris Commercial J4, van made from 1960 to 1974 under the marques of Morris initially, and later, Austin and BMC
County Route J4 (California), a road in the United States
GS&WR Class J4, a Great Southern and Western Railway Irish steam locomotive
JAC J4, a subcompact car
Malaysia Federal Route J4, a major road in Johor, Malaysia
Peterson J-4 Javelin, glider
Piper J-4, a 1939 trainer aircraft
Buffalo Airways International Air Transport Association code
GNR Class J4, a class of British 0-6-0 steam locomotives
Washington Metropolitan Transit Authority route J4, a bus route that connected College Park, Maryland and Bethesda, Maryland