1986 Danish Single European Act referendum

{{infobox referendum

|name=1986 Danish Single European Act referendum

|date=27 February 1986

|country=Denmark

|yes=1629786

|no=1268483

|invalid=29383

|electorate=3883429

|map=Folkeafstemning 1986 - Opstillingskredse.svg

|map_caption=Results by nomination district and constituency.

Yes: {{legend0|#B6C8D9|50–55%}} {{legend0|#7D9CBB|55–60%}} {{legend0|#47729E|60–65%}} {{legend0|#28497C|65–70%}} {{legend0|#28497C|70%+}}
No: {{legend0|#DEDEBD|50–55%}} {{legend0|#BCBC83|55–60%}} {{legend0|#8B8B54|60–65%}} {{legend0|#5D5D2D|65–70%}} {{legend0|#32320C|70%+}}

}}{{Politics of Denmark}}

A non-binding referendum on the Single European Act was held in Denmark on 27 February 1986.Dieter Nohlen & Philip Stöver (2010) Elections in Europe: A data handbook, p525 {{ISBN|978-3-8329-5609-7}} It was approved by 56% of voters,[http://www.eu-oplysningen.dk/dkeu/dk/afstemninger/afstemning/1986/ Folkeafstemning om EF-pakken] EU Oplysningen {{in lang|da}} with a voter turnout of 75%.Nohlen & Stöver, p534

The referendum was held by the government of the Prime Minister of Denmark, Poul Schlüter. The government was in favour of Denmark ratifying the Single European Act, but a majority in parliament voted against it.{{Cite journal |last=Borre |first=Ole |date=1986 |title=The Danish referendum on the EC Common Act |url=https://www.sciencedirect.com/science/article/abs/pii/0261379486900089 |journal=Electoral Studies |volume=5 |issue=2 |pages=189–193 |doi=10.1016/0261-3794(86)90008-9 |issn=0261-3794}} The referendum was the last Europe-related referendum in which parties such as the Social Democrats and the Social Liberal Party were against ratification.