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)