Belize

(1) Every person born in Belize, immediately before Independence Day, shall become a citizen of Belize on Independence Day.
(2) Every person who, immediately before Independence Day, is a citizen of the United Kingdom and Colonies-
(a) having become such a citizen under the British Nationality Act 1948 by virtue of his having been naturalised in Belize as a British subject before that Act came into force; or
(b) having while resident in Belize become such a citizen by virtue of his having been naturalised or registered under that Act, shall become a citizen of Belize on Independence Day.
(3) Every person born outside Belize, before Independence Day, shall become a citizen of Belize on Independence Day if his father or mother becomes, or would but for his death or the renunciation of his citizenship have become, a citizen of Belize by virtue of subsection (1) or (2) of this section.
(4) Every person born outside Belize before Independence Day shall become a citizen of Belize on Independence Day if one of his grandparents becomes, or would but for his death or renunciation of his citizenship have become, a citizen of Belize by virtue of subsection (1) or (2) of this section.
(5) Every woman shall become a citizen of Belize on Independence Day if immediately before Independence Day, she is married to a person who becomes or, but for his death or the renunciation of his citizenship, would have become a citizen of Belize by virtue of subsection(1), (2), (3) or (4) of this section.
… (Sec. 23)

Every person born in Belize on or after Independence Day shall become a citizen of Belize at the date of his birth:
Provided that a person shall not become a citizen of Belize by virtue of this section if at the time of his birth-
(a) neither of his parents is a citizen of Belize and his father or mother possesses such immunity from suit and legal process as is accorded to the envoy of a foreign sovereign power accredited to Belize; or
(b) his father or mother is a citizen of a country with which Belize is at war and the birth occurs in a place then under occupation by that country. (Sec. 24)

A person born outside Belize on or after Independence Day shall become a citizen of Belize at the date of his birth if, at that date, his father or mother is a citizen of Belize. (Sec. 25)

(1) The following persons may, upon making application at any time after Independence Day, be registered as citizens of Belize-
(a) any person who is married to a citizen of Belize;
(b) any person who has been resident continuously in Belize for a period of five years immediately before the date of his application.
(2) The National Assembly shall prescribe by law the procedure for making and determining applications, and the conditions to be fulfilled by persons making applications, for registration under this section.
… (Sec. 26)

A citizen of Belize by birth or descent who acquires the citizenship of any other country may, if the laws of the other country so permit and at his option, retain his citizenship of Belize. (Sec. 27)

(1) The National Assembly may make provision, not inconsistent with this Part, in respect of citizenship, including provision for-
(a) the acquisition of citizenship of Belize by persons who are not eligible or who are no longer eligible to become citizens of Belize under this Part;
(b) revoking the citizenship of any person referred to in section 26 (1) of this Constitution;
(c) the renunciation by any person of his citizenship of Belize.
... (Sec. 28)