Under Greek nationality law, citizenship is mainly based on the principle of ius sanguinis and can be acquired by descent, by adoption, by declaration, by enlistment in the armed forces or through naturalisation. Thus, a child born to at least one Greek national acquires citizenship automatically at birth, irrespective of the place of birth.
Under Greek law Art. 31 Civil Code, Art 2 par. 2 Law 4251/2014 dual citizenship is allowed. A Greek citizen will not lose Greek citizenship upon acquiring a second citizenship, unless a request for renunciation is made as per Art. 16 Law 3284/2004. In addition, the Greek code does not specify any consequences in relation to registration or renunciation and thus Greek citizens are allowed to hold dual citizenship without any special conditions.