Constitution of the Republic of Singapore · 2020 Revised Edition · Part 10 · Citizenship
128. Renunciation of citizenship
Feedback & supportAny citizen of Singapore of or over the age of 21 years and of sound mind who is also or is about to become a citizen of another country may renounce his citizenship of Singapore by declaration registered by the Government, and shall upon such registration cease to be a citizen of Singapore.
citizen of Singapore
“citizen of Singapore” means any person who, under the provisions of this Constitution, has the status of a citizen of Singapore;
The Government may withhold the registration of a declaration under this Article —
if the declaration is made during any war in which Singapore is engaged; or
if the declaration is made by a person subject to the Enlistment Act 1970 unless he has —
discharged his liability for full‑time service under section 12 of that Act;
rendered at least 3 years of operationally ready national service under section 13 of that Act in lieu of such full‑time service; or
complied with such conditions as may be determined by the Government.
This Article applies to a woman under the age of 21 years who has been married as it applies to a person of or over that age.