X11 (disambiguation)

X11 is a windowing system common on Unix-like operating systems.

X11 or X-11 may also refer to:

Technology

 * X11 (hashing algorithm)
 * N11 code, any of a set of public service telephone numbers in North America
 * X11.app, the implementation of the X Window System in Mac OS X
 * X-11-ARIMA, a predecessor of the X-13ARIMA-SEATS statistics software package

Transportation

 * X11 (New York City bus)
 * Convair X-11, the first testbed for what became the Atlas missile program
 * Honda X11, a motorcycle
 * Chevrolet Citation X-11, a performance-enhanced version of the Chevrolet Citation car
 * X11, a variation of the SL X10 train

Other uses

 * Settlement X11, of the Kuhikugu archaeological site in Brazil