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1. Everyone shall have the right to determine and declare his (her) nationality. Nobody shall be forced to determine and declare his (her) nationality.
… (Art. 26)

(1) Spanish nationality shall be acquired, retained and lost in accordance with the provisions of the law.
(2) No person of Spanish birth may be deprived of his or her nationality.
(3) The State may negotiate dual nationality treaties with Latin-American countries or with those which have had or which have special links with Spain. In these countries Spaniards may become naturalized without losing their nationality of origin, even if those countries do not grant a reciprocal right to their own citizens. (Sec. 11)

Naturalisation is granted by the federal legislative power. (Art. 9)

(1) The child of a Hungarian citizen shall be a Hungarian citizen by birth. A cardinal Act may specify other instances of the origin or acquisition of Hungarian citizenship.
…
(3) No one shall be deprived of Hungarian citizenship established by birth or acquired in a lawful manner.
(4) The detailed rules for citizenship shall be laid down in a cardinal Act. (Foundation, Art. G)

(1) In the following matters legislation is the business of the Federation, execution that of the provinces:
1. nationality;
… (Art. 11)

(1) The Federation shall have exclusive legislative power with respect to:
…
2. citizenship in the Federation;
… (Art. 73)

Slovene citizenship shall be regulated by law. (Art. 12)

1. Everyone is accorded the rights to personal identity, to the development of personality, to civil capacity, to citizenship,
…
4. Deprivation of citizenship and restrictions on civil capacity may only occur in the cases and under the terms that are provided for by law, and may not be based on political motives. (Art. 26)

(1) A person born in the United Kingdom after commencement or in a qualifying territory on or after the appointed day, shall be a British citizen if at the time of the birth his father or mother is—
(a) a British citizen; or
(b) settled in the United Kingdom or that territory.
(1A) A person born in the United Kingdom or a qualifying territory on or after the relevant day shall be a British citizen if at the time of the birth his father or mother is a member of the armed forces.
(2) A new-born infant who, after commencement, is found abandoned in the United Kingdom, or on or after the appointed day is found abandoned in a qualifying territory, shall, unless the contrary is shown, be deemed for the purposes of subsection (1)—
(a) to have been born in the United Kingdom after commencement or in that territory on or after the appointed day; and
(b) to have been born to a parent who at the time of the birth was a British citizen or settled in the United Kingdom or that territory.
(3) A person born in the United Kingdom after commencement who is not a British citizen by virtue of subsection (1), (1A) or (2) or section 10A shall be entitled to be registered as a British citizen if, while he is a minor—
(a) his father or mother becomes a British citizen or becomes settled in the United Kingdom; and
(b) an application is made for his registration as a British citizen.
(3A) A person born in the United Kingdom on or after the relevant day who is not a British citizen by virtue of subsection (1), (1A) or (2) or section 10A shall be entitled to be registered as a British citizen if, while he is a minor—
(a)his father or mother becomes a member of the armed forces; and
(b)an application is made for his registration as a British citizen.
… (British Nationality Act 1981, Sec. 1)

The circumstances in which Monegasque nationality may be acquired are laid down by law. The circumstances in which a person who has acquired Monegasque nationality by naturalization may be deprived of it are laid down in the law.
Loss of Monegasque nationality in any other circumstance may occur only, as prescribed by law, further to the intentional acquisition of another nationality or of service unlawfully carried out in a foreign army. (Art. 18)