11A

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