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(1) Unless disqualified pursuant to paragraph (3) of this Section, any person who is not a citizen of the Republic of the Marshall Islands shall become a citizen by registration if, upon application, the High Court is satisfied either:
(a) that he has land rights; or
(b) that he has been resident in the Republic for not less than 3 years, and is the parent of a child who is a citizen of the Republic; or
(c) that he is of Marshallese descent, and that in the interests of justice his application should be granted.
... (Art. XI, Sec. 2)

The Olbiil Era Kelulau shall have the following powers:
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(4) to regulate immigration and establish a uniform system of naturalization;
… (Art. IX, Sec. 5)

(1) Subject to subsections (3) and (4), a person born in Tuvalu on or after the date on which this Constitution took effect is a citizen of Tuvalu by birth.
(2) A person born outside Tuvalu on or after the date on which this Constitution took effect is a citizen of Tuvalu by birth if on the date of his birth either of his parents is, or would but for his death have been, a citizen of Tuvalu.
(3) Subject to subsection (5), a person does not become a citizen of Tuvalu by virtue of subsection (1) if at the time of his birth -
(a) neither of his parents was a citizen of Tuvalu; and
(b) his father had the privileges and immunities of an envoy to Tuvalu from a country with which Tuvalu had diplomatic relations.
(4) Subject to subsection (5), a person does not become a citizen of Tuvalu by virtue of subsection (1) if at the time of his birth—
(a) his father was a citizen of a country with which Tuvalu was at war; and
(b) the birth occurred in a place in Tuvalu occupied by that country.
(5) In the case of a person who was born out of wedlock, a reference in subsection (3) or (4) to his father shall be read as a reference to his mother. (Sec. 46)

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(3) Citizenship of Fiji shall only be acquired by birth, registration or naturalisation.
(4) Citizens of Fiji may hold multiple citizenship, which means that—
(a) upon accepting the citizenship of a foreign country, a person remains a citizen of Fiji unless he or she renounces that status;
(b) a former citizen of Fiji, who lost that citizenship upon acquiring foreign citizenship, may regain citizenship of Fiji, while retaining that foreign citizenship unless the laws of that foreign country provide otherwise; and
(c) upon becoming a citizen of Fiji, a foreign person may retain his or her existing citizenship unless the laws of that foreign country provide otherwise.
(5) A written law shall prescribe—
(a) the conditions upon which citizenship of Fiji may be acquired and the conditions upon which a person may become a citizen of Fiji;
(b) procedures relating to the making of applications for citizenship by registration or naturalisation;
(c) conditions relating to the right to enter and reside in Fiji;
(d) provisions for the prevention of statelessness;
(e) rules for the calculation of periods of a person’s lawful presence in Fiji for the purpose of determining citizenship;
(f) provisions relating to the renunciation and deprivation of citizenship; and
(g) such other matters as are necessary to regulate the granting of citizenship. (Sec. 5)

The following powers are expressly delegated to Congress:
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(c) to regulate immigration, emigration, naturalization, and citizenship;
… (Art. IX, Sec. 2)

(1) Subject to Section 64, a citizen who has reached voting age and is of full capacity who-
(a) obtains the nationality or citizenship of another country by a voluntary act (other than marriage);
…
loses his citizenship.
… (Sec. 70)

Anyone born after the Day of Independence, whether in Vanuatu or abroad, shall become a citizen of Vanuatu if at least one of his parents is a citizen of Vanuatu. (Art. 11)

Any person, other than a person of I-Kiribati descent, who—
a. has attained the age of eighteen years before Independence Day;
b. becomes a citizen of Kiribati by virtue of section 20 or 21 of this Constitution; and
c. is on Independence Day a national of some other country, shall cease to be a citizen of Kiribati at the expiry of a period of two years after Independence Day or such longer period as may be prescribed, unless before the expiry of that period he has renounced or lost his nationality of that other country or, if the law of that other country makes no provision for or does not permit him to renounce his nationality of that other country, made such a declaration as may be prescribed. (Sec. 24)

(1) Parliament may make provision for the acquisition of Nauruan citizenship by persons who are not otherwise eligible to become Nauruan citizens under the provisions of this Part.
(2) Parliament may make provision for depriving a person of his Nauruan citizenship being a person who has acquired the nationality of another country otherwise than by marriage.
(3) Parliament may make provision for depriving a person of his Nauruan citizenship being a person who is a Nauruan citizen otherwise than by reason of Article 71 or Article 72.
(4) Parliament may make provision for the renunciation by a person of his Nauruan citizenship. (Art. 75)

Every person born on or after Independence Day, whether within or outside Solomon Islands, shall become a citizen of Solomon Islands at the date of his birth if at that date either of his parents is, or would but for his death have been, a citizen of Solomon Islands. (Sec. 22)