The applicant was born in Austria to an Austrian mother and a father who was a refugee from Poland. The applicant argued that his father was stateless at the time of his birth (as this would lead to applicant being recognised as Austrian), and requested the authorities to accept his father's testimony as proof. The authorities concluded that the applicant's father was a Polish national solely on the basis of the Polish legislation, without evaluating the content of the testimony. The decision was declared unlawful on procedural grounds, as the testimony should have been taken into account.
Applicant is a refugee from Vietnam, whose refugee status was withdrawn after a number of criminal convictions, combined with the fact that he made a safe trip to Vietnam. He applied for a travel document for foreigners claiming that he is stateless or at least that his nationality status is unclear. The authorities maintained that he was still a Vietnamese national, but the Court sided with the applicant, insisting that the authorities should have taken more factors into account in considering the applicant's potential statelessness.
The applicant was born in Iraq and formerly possessed Iraqi identity documents. After establishing permanent legal residence in Austria he applied for a travel document for foreigners on the basis that he has an "unclear nationality" status. The application was rejected without granting the applicant the right to an oral hearing. The Constitutional Court upheld the applicant's right to have an opportunity to explain his allegedly unclear nationality status in an oral hearing.
The applicant was born in Armenia and belongs to Yazidis minority. After many years of unlawful residence in Austria, and several unsuccessful attempts to deport him, he applied for a toleration permit, which was refused as he did not cooperate sufficiently with the authorities' attempts to obtain travel documents for him to travel to Armenia, and there is also a possibility he may be a Russian or a Ukrainian national. The Court sided with the applicant, stating that it was the authorities' responsibility to substantiate any presumed links between the applicant and a specific state, before the duty to cooperate could be imposed.
The applicant acquired Austrian nationality in 1995 and renounced her former Turkish nationality in 1996 as a condition for retaining the Austrian nationality. In 2018 the Austrian authorities declared that she has no longer been an Austrian national since 1997 as it appeared that she voluntarily re-acquired her Turkish nationality at that time, which is a ground for automatic loss of Austrian nationality. The Court set aside the determination of loss of Austrian nationality as it did not carry out a proportionality test on the basis of the Tjebbes judgment.
The applicants are children born presumably in a surrogacy arrangement in Ukraine to two Austrian nationals. Even though the custody of the commissioning parents over the applicants was confirmed under the Austrian law, their parentage and consequently the Austrian nationality of the applicants was initially denied. The Court considered that the best interests of the child prevail in such a case over the prohibition of surrogacy under Austrian law, and confirmed the applicants' right to Austrian nationality.
The applicant acquired Austrian nationality by naturalisation in 1997, and renounced her Turkish nationality in that context. In 2018 it appeared that the applicant was listed on the voter registers for Turkish nationals abroad. She did not provide proof that she did not re-acquire Turkish nationality, and on that basis the Austrian authorities declared she has lost her Austrian nationality automatically due to acquisition of a foreign nationality.
In order to acquire Austrian nationality, the applicant renounced her Turkish nationality in 1997. Over a decade later it came to light that she has re-acquired Turkish nationality in 1998, which according to Austrian law resulted in automatic loss of the Austrian nationality. She renounced her Turkish nationality again in 2009, but in 2010 the Austrian authorities confirmed that she was no longer Austrian since 1998. The Court found that this was not in violation of Austria's obligation to avoid statelessness since the applicant's statelessness was not caused by a decision of the Austrian authorities.