The Twenty-third Amendment may refer to the:
- Twenty-third Amendment of the Constitution of India, 1969 amendment relating to reserved seats in the parliament, including the abolition of tribal reservation for Nagaland
- Twenty-third Amendment of the Constitution of Ireland, which permitted the state to recognise the International Criminal Court
- Twenty-third Amendment to the Constitution of Pakistan, which granted legal cover to military courts
- Twenty-third Amendment to the United States Constitution, which allowed residents of the District of Columbia to vote in presidential elections
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