X61

X61 or X-61 may refer to:
 * X61 (New York City bus), an express bus route in New York City
 * X61 (railcar), a railcar of the Alstom Coradia family
 * Dynetics X-61 Gremlins, an experimental UAV by Dynetics
 * ThinkPad X61, a laptop computer of the ThinkPad X series