A second referendum on the Maastricht Treaty was held in Denmark on 18 May 1993. 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.
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 trapped by a crowd fired 113 shots into the crowd. 11 people were subsequently treated for gunshot wounds. Some 90 police officers were injured during the riots.