11B

11B may refer to :
 * WASP-11b, an extrasolar planet discovered in 2008
 * GCR Class 11B, a class of British 4-4-0 steam locomotive
 * Ontario Highway 11B
 * New Hampshire Route 11B
 * New York State Route 11B
 * 802.11b, an IEEE standard for wireless networking
 * Boron-11 (11B), an isotope of boron
 * The U.S. Army Military Occupational Specialty code for an enlisted infantry soldier – phonetically pronounced "Eleven Bravo"
 * U.S. Federal Rule of Civil Procedure 11(b), providing for sanctions against attorneys who bring frivolous lawsuits