Start with the closest Croatian-born relative in your direct line. If it is a parent who was a citizen when you were born, read the parent path first: it can be the simplest. If it is a grandparent or great-grandparent, the question is when they left. Before 8 October 1991, Article 11 applies to you as their descendant.
Your spouse can apply alongside you on the strength of your descent, and children under 18 become Croatian with you. If your family left after 1991, or your link is through Croatian identity rather than birth, Article 16 may help; it is explained on our law page.
Not sure? The two-minute quiz asks the questions that decide it, and a free consultation with us confirms where you stand.