10B

10B or X-B may refer to:
 * Oflag X-B, a World War II German POW camp for officers located near Nienburg am Weser
 * Stalag X-B, a World War II German Prisoner-of-war camp located near Sandbostel
 * A Mazda Wankel engine model
 * Boron-10 (10B), an isotope of boron