Croatian citizenship can be acquired in the following ways:
Jus sanguinis: By descent if at least one of the parents is a Croatian citizen
Jus soli: By birth in Croatia, or a child found in Croatia whose parents are unknown
By naturalisation
By international treaties
Citizenship by descent
Under Article 4 of the Law on Croatian Citizenship, a child acquires Croatian citizenship by origin:
if both of his parents are Croatian citizens at the time of the child's birth;
if one of his parents is a Croatian citizen at the time of the child's birth and the child is born in the Republic of Croatia;
if one of the parents is a Croatian citizen at the time of the child's birth, the other parent without citizenship or of unknown citizenship, and the child is born abroad.
Croatian citizenship may also be acquired by a mix of descent and registration, for a child born abroad, one of whose parents is a Croatian citizen at the moment of the child's birth,"if the child is registered for Croatian citizenship by 18 years of age at a competent authority of the Republic of Croatia abroad or in the Republic of Croatia, or if he settles in the Republic of Croatia", or if the child would not otherwise acquire any citizenship.
Dual citizenship
Croatia allows its citizens to hold foreign citizenship in addition to their Croatian citizenship. Under Article 8 of the Law on Croatian Citizenship, naturalisation into Croatian citizenship requires renunciation of the other country's citizenship, where allowed by the other country. However, this does not apply in a number of situations, including descendants within the third degree of Croatian emigrants, national interest of Croatia, and former Croatians who renounced Croatian citizenship to practice a profession in another country.
Visa requirements for Croatian citizens are administrative entry restrictions by the authorities of other states placed on citizens of Croatia. In 2018, Croatian citizens had visa-free or visa on arrival access to 156 countries and territories, ranking the Croatian passport 20th in terms of travel freedom according to the Henley visa restrictions index. In 2017, the Croatian nationality is ranked twenty-eighth in the Nationality Index. This index differs from the Visa Restrictions Index, which focuses on external factors including travel freedom. The QNI considers, in addition to travel freedom, on internal factors such as peace & stability, economic strength, and human development as well.