Irish Nationality and Citizenship Act, 1935

Loss of citizenship on acquisition of citizenship of another country.

21.—(1) Save as is otherwise provided by this Act, every citizen of Saorstát Eireann who, after he has attained the age of twenty-one years, becomes a citizen of another country shall thereupon cease to be a citizen of Saorstát Eireann.

(2) Every natural-born citizen of Saorstát Eireann who is at birth or becomes before he attains the age of twenty-one years a citizen of another country and within one year after attaining the age of twenty-one years makes and lodges with the Minister in the prescribed form and manner a declaration of alienage shall, as from the lodgment of such declaration, cease to be a citizen of Saorstát Eireann, but without prejudice to any previous loss of such citizenship.