2011 referendum may refer to:
2009–2011 Catalan independence referendums 2011 Egyptian constitutional referendum 2011 Irish constitutional referendums 2011 Italian referendums 2011 Liberian constitutional referendum 2011 Liechtenstein referendums 2011 Moroccan constitutional referendum 2011 New Zealand voting system referendum 2011 Palauan casino referendum 2011 Seoul free lunch referendum 2011 South Ossetian referendum 2011 South Sudanese independence referendum 2011 United Kingdom Alternative Vote referendum Results of the 2011 United Kingdom Alternative Vote referendum 2011 Welsh devolution referendum
See also