In order to apply the Croatian citizenship, you will need the Application Form 1 (Obrazac 1) for adults or Application Form 2 (Obrazac 2) if minor children are covered by your application. Both forms are available on this website under the heading ¨Forms¨. The following supporting documents need to accompany your application:
Applicants under the "emigrant" category have to enclose documents which demonstrate that they have been declaring themselves as Croatian in public life, such as certified copy of work, military or school records (radna knjižica, vojna knjžica, svjedodžba, indeks), birth or marriage certificate etc, in which the ethicity had been stated. Those who base their application on the fact that they are of the Croatian ethnicity (pripadnik hrvatskog naroda), can demonsstrate this fact by submitting proof of their involvement in the protection and promotion of the Croatian interests and their active involvement in the Croatian cultural, scientific or sports associations abroad. If the application is based on the Croatian ethnicity of the applicants's parents, it is necessary to submit documents demonstrated that the parents have been declaring themselves as Croatians.
If you would like to know more details about which requirements have to met to obtain Croatian citizenship, plaese visit the web site of the Ministry of the Interrior of the Republic of Croatia on: www.mup.hr.