11/3 may refer to: November 3 (month-day date notation) March 11 (day-month date notation) 11 shillings and 3 pence in UK predecimal currency A type of hendecagram 2004 Madrid train bombings 2011 Tōhoku earthquake and tsunami Fukushima Daiichi nuclear disaster, caused by the earthquake and tsunami

See also 3/11 (disambiguation) 113 (disambiguation)