J23 may refer to:
Roads County Route J23 (California)
Vehicles FVM J 23, a Swedish fighter aircraft GNR Class J23, a British steam locomotive , a Hunt-class minesweeper of the Royal Navy , an Östergötland-class destroyer of the Swedish Navy
Other uses Agent J-23, a character in the Polish television series Stawka większa niż życie Gyroelongated square cupola, a Johnson solid (J23) J23, an album by Danny K The 2023 Spanish general election, nicknamed "23J" by the Spanish media