The Danish people voted in favour of joining the Unified Patent Court (UPC) in a public referendum held on 25 May 2014. In Denmark (which has an opt-out clause in relation to certain EU legislation) the referendum was necessary because an insufficient proportion of MPs in the Danish parliament supported proposals to join the UPC. In the referendum approximately 34% of Danish residents voted in favour of joining the UPC compared with approximately 20% who voted against (the total participation in the referendum was approximately 56% including abstentions).

Following the referendum, the Danish Parliament will ratify the Agreement on the UPC and Denmark will become the fifth member state to ratify it (after Austria, Belgium, France and Malta).