A second referendum on the Maastricht Treaty was held in Denmark on 18 May 1993.^[1] After rejecting the treaty in a referendum the previous year, this time it was approved by 56.7% of voters with an 86.5% turnout.^[2]

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1993 Danish Maastricht Treaty referendum

18 May 1993
Results
Choice Votes  % Yes 1,930,391 56.74% No 1,471,914 43.26% Valid votes 3,402,305 98.99% Invalid or blank votes 34,635 1.01% Total votes 3,436,940 100.00% Registered voters/turnout 3,974,672 86.47%
Results by nomination district and constituency Yes:      50–55%      55–60%      60–65%      65–70%      70%+ No:      50–55%      55–60%      60–65%

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It was the second attempt to ratify the Maastricht Treaty, which could not come into effect unless ratified by all members of the European Union. Thus, the Edinburgh Agreement granted Denmark four exceptions from the Maastricht Treaty, leading to its eventual ratification.

When the result of the referendum was announced, the outcome and frustrations about the referendum being held only a year after the Danes had rejected the previous treaty led to riots in the Nørrebro area of Copenhagen, during which police shot and wounded at least 11 people "to prevent an injured colleague being stoned to death". These 11 people, not in critical conditions, were subsequently treated for gunshot wounds as a result of the shooting.^[3] 90 police officers were injured during the riots.^{[citation needed]}