3/11
# 3/11

3/11 may refer to:

* March 11, in month-day date notation
* 3 November, in day-month date notation
* 3rd Battalion, 11th Marines
* March, 11 A.D.; see AD 11
* November, 3 A.D.; see AD 3
* 2011 Tōhoku earthquake and tsunami
   * Fukushima Daiichi nuclear disaster, caused by the earthquake and tsunami
* 2004 Madrid train bombings
