11/9

11/9 may refer to:


 * November 9, US and Asian style date
 * Fahrenheit 11/9, an American documentary film
 * September 11, used in the day-month-year stylization of dates
 * The September 11 attacks, a series of four coordinated terrorist attacks in the United States of America on September 11, 2001
 * September, 11 A.D.; see AD 11
 * November, 9 A.D.; see AD 9
 * 11 shillings and 9 pence in UK predecimal currency
 * "11/9", an episode of American Horror Story: Cult