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