X100

X100 or X-100 may refer to:
 * Curtiss-Wright X-100, an experimental aircraft with tilt rotors
 * Fujifilm X100, a series of digital cameras
 * X-100 (house), an experimental steel house in California
 * Lotus M90 (also Lotus X100), a concept car
 * New South Wales X100 class locomotive, a group of rail tractors built by Chullora Railway Workshops
 * Rockman X100, a model of headphone amplifier by Scholz Research & Development, Inc.
 * RT.X100, a real-time PCI video editing card
 * Triton X-100, a nonionic surfactant
 * SS-100-X, US President Kennedy's state car in which he was assassinated in 1963