Adopted minors may be naturalised through Erstreckung (extension) under §17 StbG upon application by the adoptive parents.
A child born in Austria who would otherwise be stateless acquires Austrian citizenship ex lege at birth under §14 StbG.
Minor children may acquire Austrian citizenship derivatively through Erstreckung under §§17-18 StbG when a parent is granted Austrian citizenship.
A child born in wedlock acquires Austrian citizenship at birth if at least one parent is an Austrian citizen at the time of birth.
A child born out of wedlock acquires Austrian citizenship at birth; if only the father is Austrian, acquisition depends on paternity acknowledgement under §7(3) StbG.
Article 7 of the Austrian State Treaty 1955 recognises Slovene and Croatian minority communities. Recognition-and-protection regime rather than an independent acquisition pathway.
Discretionary grant by Bundesregierung on grounds of compelling public interest evidenced by sustained economic contribution.
Six years of continuous lawful residence combined with at least three years of cohabitation with an Austrian spouse.
Austria operates no military-service citizenship route; §34 StbG treats foreign military service as a ground for loss rather than acquisition.
Ten years of lawful uninterrupted residence plus B1 German, civics test, good character, financial self-sufficiency, renunciation of prior nationality.
Six years of continuous lawful residence for recognised refugees, EEA nationals, or Integrationsabschluss holders.
Four years with evidence of exceptional integration.
Former Austrian citizens may reacquire via reduced-residence §10(1)(9) route.
Austrian nationals persecuted between 1933 and 1955 by the National Socialist regime may acquire Austrian citizenship by notification (Anzeigeverfahren), preserving any existing foreign nationality.
Direct-line descendants of a §58c(1) qualifying persecution victim may acquire Austrian citizenship by notification under §58c(1a), preserving any existing nationality.
Spouses or registered partners of a §58c(1) qualifying Austrian national may acquire Austrian citizenship by notification under §58c(2).
Former Austrian nationals who were persecuted and lost nationality abroad under conditions set out in §58c(3) may reacquire Austrian citizenship by notification.
Austrian authorities may grant citizenship under §10(6) StbG on grounds of exceptional achievement in science/economy/sport/culture, or compelling public interest.