If you are planning to marry in Denmark, guidelines are listed below.
According to the Danish Marriage Act and rules prescribed by the Danish Ministry of Justice, the following documents are required to be married in Denmark:
◾Birth certificate and valid passport.
Note: If your name has been legally changed since the issuance of your birth certificate or passport, you should present an official court decree to this effect.
◾Persons under the age of 18 may not contract marriage without permission from Københavns Overpræsidium (the Prefect of Copenhagen), Hammerensgade 1, 1267 Copenhagen K., Tel. +45 33 12 23 80.
◾If one of the parties is under guardianship, documentation of the guardian’s consent to the marriage must be presented.
◾If one of the parties has been previously married, divorce decree or death certificate must be submitted. In Copenhagen, documentation should be forwarded to: Københavns Overpræsidium (the Prefect of Copenhagen), Hammerensgade 1, 1267 Copenhagen K., Tel. +45 33 12 23 80 for approval before arriving in Copenhagen. If you plan to get married outside the city of Copenhagen, you should contact the local "Statsforvaltning" (the regional state administration).
In general, register offices need a few weeks to process the papers.
Some churches and register offices may require additional documents or may require that you reside in their municipality (kommune) for a period of time before the marriage may be performed. Please contact the church office or the register office in the city or town where you wish to be married to confirm their requirements.
For more information please check the website of the City of Copenhagen.