J1

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
• 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 World War I British submarine

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 live album by Taiwanese singer Jolin Tsai

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

Other uses

• J-1 visa, a type of U.S. visa for exchange visitors
• The J1 League, the top division of Japanese association football