J6

J6 may refer to:

Military vehicles

 * Junkers J 6, a German fighter aircraft
 * Shenyang J-6, Chinese version of Soviet MiG-19 jet fighter
 * J6 Jaktfalken, a Swedish fighter aircraft
 * HMS J6, a World War I UK submarine sunk in a friendly fire incident
 * HMS Alresford, a UK minesweeper, pennant number J06

Steam locomotives

 * MGWR Class J6, successor to the MGWR Class H steam locomotive
 * LNER Class J6, a class of British steam locomotives

Politics

 * J6, an abbreviation for the January 6 United States Capitol attack of 2021
 * J6, The United States House Select Committee on the January 6 Attack
 * J6 hearings – Public hearings of the United States House Select Committee on the January 6 Attack
 * Justice for J6 rally, related event

Other uses

 * J6, the ITU prefix for the island country of Saint Lucia
 * J06, one of the ICD-10 upper respiratory tract infection codes (J00-06)
 * ATC code J06 Immune sera and immunoglobulins, a subgroup of the Anatomical Therapeutic Chemical Classification System
 * Joint Staff J-6, a directorate of the US Department of Defense
 * pentagonal rotunda, a Johnson solid in geometry
 * Samsung Galaxy J6, an Android mobile phone
 * Judgement Six (J6), an evil organization from the video game series Virtua Fighter