J38

J38 may refer to:
 * Elongated pentagonal orthobicupola, a Johnson solid (J38)
 * HMS Caraquet (J38), a Bangor-class minesweeper of the Royal Navy
 * HMS Skipjack (J38), a Halcyon-class minesweeper of the Royal Navy
 * LNER Class J38, a British steam locomotive class
 * West Engineering XJ38, an early jet engine
 * J-38, a model of telegraph key