B17

B17 or B-17 may refer to:

Aviation

 * Boeing B-17 Flying Fortress, an American World War II heavy bomber
 * Saab B 17, series of Swedish dive bomber/reconnaissance aircraft

B-17 Flying Fortress related

 * B-17, Queen of the Skies, a solitaire board war-game
 * B-17 Bomber (game), a 1982 Mattel game made for the Intellivision console
 * B-17 Flying Fortress (computer game), a flight simulator
 * "B-17", a segment from Heavy Metal

Transportation and vehicles

 * B17 (New York City bus), a bus line serving Brooklyn
 * LNER Class B17, a British 4-6-0 steam locomotive class
 * B17, a bicycle saddle line by Brooks England
 * A generation of Nissan Sentra built since 2013

Other uses

 * Amygdalin, sometimes incorrectly referred to as vitamin B17
 * Boron-17 (B-17 or 17B), an isotope of boron
 * HLA-B17, an HLA - B serotype gene
 * B17, the Steinitz variation of the Caro-Kann Defence's code from the Encyclopaedia of Chess Openings
 * "Please Mr. Please", song about a song in slot B-17 of a jukebox
 * Sector B17, a housing scheme project in Islamabad, Pakistan