X40

X40 may refer to:


 * Boeing X-40, test platform for the X-37 Future-X Reusable Launch Vehicle
 * SJ X40, series of electric multiple units operated by SJ of Sweden
 * Southern Vectis route X40, bus route on the Isle of Wight, England
 * ThinkPad X40, laptop computer by Lenovo
 * Bestune X40, a subcompact crossover

X-40 X40