From this page you can:

1.	Start your application process for Naturalization
2.	Apply to recover your lost Danish citizenship

You can acquire Danish citizenship by one the following ways         1.    Naturalization         2.    Birth         3.    Adoption         4.    Declaration         5.    Recovery of lost citizenship Denmark applies easier nationality rules to Nordic and EU/EEA citizens than third country nationals

 

• You are under 12 years of age and adopted, through a Danish adoption order, by a married couple where at least one of the spouses is a Danish national, or by an unmarried Danish national
  
  Note: Danish nationality is acquired from the time when the legal effects of the adoption come into force
  
  Apply for Danish Citizenship by Adoption
  

• You are between the age of 18 and 23 and have lived in Denmark for an aggregate period of not less than 10 years, of which an aggregate period of not less than 5 years within the last 6 years
  
  
• You are a natural-born Danish national and lived in Denmark until attaining the age of 18, provided that you have lived in Denmark during the last two years preceding the declaration
  
  Note: If you hold a foreign nationality, such declaration can only be made if you prove that this will cause you to lose your foreign nationality
  
  
  • A person who is charged with a criminal offence or expelled by judgment or national of an enemy state at war with Denmark cannot acquire Danish nationality by declaration
    
    Apply for Danish Citizenship by Declaration

• You are at least 18 years of age and have been a continuous resident in Denmark for at least 9 years possessing certain knowledge of the Danish language
  
  
  • The required period of residence is only 8 years, for stateless citizens and refugees
  
  
  Note: If you are a Nordic national this period is reduced to 2 years. If you have been married to a Danish citizen for at least 3 years, you require only 6 years of residence in Denmark
  
  
  • You must renounce your former citizenship except when you are a refugee or when renunciation is either legally or de facto impossible
    
    Apply for Danish Citizenship by Naturalization

• You will lose your Danish Citizenship if you acquire another nationality by petition, explicit consent or by taking up a position with the public authorities of another country
  
  Note: If you are a Danish national, born abroad but have never lived in Denmark nor stayed there under conditions indicating interdependence with the country, you will lose your Danish citizenship upon attaining the age of 22. However, this does not apply should you thereby become stateless
  
  Residence in a Nordic country for an aggregate period of not less than 7 years is equivalent to residence in Denmark
  
  Consult VisaPro Immigration Adviser

• You are a natural-born Danish national who has lived in Denmark until attaining the age of 18 and also during the last 2 years preceding the nationality declaration
  
  Note: If you hold a foreign nationality, such declaration can only be made if you prove that this will cause you to lose your foreign nationality
  
  
• You have lost your Danish citizenship and have subsequently remained a national of a Nordic country after having taken up permanent residence in Denmark
  
  Apply for Recovery of Danish Citizenship