Belize Constitution Act. Country/Territory Belize Document type Constitution Date 1981 Source FAO, FAOLEX Subject Water Keyword Ownership Indigenous peoples Human rights Sustainable use Geographical area Americas, Central America, Latin America and the Caribbean, Small Island Developing States Entry into force notes The Constitution of Belize entered into force on 21 September 1981. The last amended version of the Constitution entered into force on 1 March 2012. Full text English