J17

J17 may refer to:

Locomotives

 * GSR Class J17, an Irish steam locomotive
 * LNER Class J17, a British steam locomotive class

Ships

 * HMS Speedy (J17), a Halcyon-class minesweeper of the Royal Navy
 * INS Sutlej (J17), a Sandhayak-class survey ship of the Indian Navy

Other uses

 * County Route J17 (California)
 * Gyroelongated square bipyramid, a Johnson solid (J17)
 * Just Seventeen, a British magazine
 * Small nucleolar RNA snR60/Z15/Z230/Z193/J17
 * Pneumonia