J6 may refer to:

Military Joint Staff J-6, a directorate of the US Department of Defense 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

Politics J6, an abbreviation for the January 6 United States Capitol attack of 2021 J6 Committee, 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

Science and technology ATC code J06 Immune sera and immunoglobulins, a subgroup of the Anatomical Therapeutic Chemical Classification System J06, one of the ICD-10 upper respiratory tract infection codes (J00-06) MGWR Class J6, successor to the MGWR Class H steam locomotive LNER Class J6, a class of British steam locomotives Pentagonal rotunda, a Johnson solid in geometry Samsung Galaxy J6, an Android mobile phone iCar 03, a battery electric compact crossover SUV sold in some markets as the Jaecoo J6 or Chery J6

Other uses J6, the ITU prefix for the island country of Saint Lucia Judgement Six (J6), an evil organization from the video game series Virtua Fighter

See also 6J (disambiguation)