11A may refer to:
Freon 11A or trichlorofluoromethane New Hampshire Route 11A New York State Route 11A TG-11A, or Stemme S10, a German glider Clayton Municipal Airport (Alabama) (FAA LID: 11A) The anticlockwise bus service on West Midlands bus route 11 802.11a, an amendment to the IEEE 802.11 wireless local network specifications
See also Stalag XI-A, a German Army World War II prisoner-of-war camp near Altengrabow A11 (disambiguation)