2011 | 2011 ATP Challenger Tour | 2011 ATP World Tour | sequence | 2011 Rugby World Cup | 2011 ITF Women's Circuit | 2011 Tōhoku earthquake and tsunami | 2011 Pan American Games | 2011 Christchurch earthquake | 2011 Summer Universiade | 2011 Pacific Games | Miss Universe 2011 | 2011 Copa América | Eurovision Song Contest 2011 | 2011 WTA Tour | 2011 in radio | tornado | Panavia Tornado | Canadian federal election, 2011 | 2011 Southeast Asian Games | 2011 in paleontology | 2011 Cricket World Cup | 2011 World Championships in Athletics | 2011 in music | 2011 FIFA Women's World Cup | 2011–12 NCAA football bowl games | Mexico at the 2011 Pan American Games | 2011 Norway attacks | 2011 NCAA Division I FBS football season | 2011 Fed Cup World Group II Play-offs |
April 2011 was the most active month for tornadoes on record, capped by a very large tornado outbreak (the largest on record) that killed more than 324 people in the final week.
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Overall, the tornado outbreak resulted in 184 deaths, 6 of those non-tornadic, making it second only to the April 25–28, 2011 tornado outbreak as the deadliest since 1974, and the second costliest tornado outbreak in US history behind that same April 2011 outbreak, with insured damage estimated at $4–7 billion.