J1, J01, J.I, J-I or J-1 may refer to:
Vehicles
Aircraft AEG J.I, a World War I German ground attack aircraft Albatros J.I, a 1917 German ground-attack single-engine biplane aircraft Junkers J 1, a 1916 German aircraft Junkers J.I, a 1917 German aircraft Lawrance J-1, an early 1920s engine used in American aircraft
Locomotives LB&SCR J1 class, a British LB&SCR locomotive LNER Class J1, a class of British steam locomotives PRR J1, an American PRR steam locomotive
Other vehicles J-I rocket, a Japanese solid rocket expendable launch vehicle J1 type submarine, a World War II Imperial Japanese Navy cruiser submarines class HMS J1, a 1915 World War I British submarine JAC J1, a subcompact car Al Fahd 300 (J-1), an Iraqi surface-to-surface missile project
In arts and entertainment J-1 World Heavyweight Championship, a professional wrestling competition J1 World Tour, a concert tour by Taiwanese singer Jolin Tsai J1 Live Concert, a 2005 live album by Taiwanese singer Jolin Tsai "J1" (song), a 2008 song by Mallu Magalhães J.I the Prince of N.Y, American rapper also known as J.I.
In mathematics and science ATC code J01, Antibacterials for systemic use, a subgroup of the Anatomical Therapeutic Chemical Classification System Haplogroup J1 (Y-DNA), a Y-DNA haplogroup Janko group J1, in mathematics S/2003 J 1, a former name for Eukelade, a satellite of Jupiter First-order Bessel function of the first kind, denoted J01, the ICD-10 code for acute sinusitis, a medical condition J1, the Johnson solid notation for an equilateral square pyramid
Other uses J-1 visa, a type of U.S. visa for exchange visitors The J1 League, the top division of Japanese association football Samsung Galaxy J1, a smartphone J1, abbreviation, reference to the director staff of the Joint Chiefs of Staff Nikon 1 J1, mirrorless interchangeable lens camera
See also 1J (disambiguation)