Eighth Amendment may refer to:

• Eighth Amendment to the United States Constitution, part of the United States Bill of Rights
• Eighth Amendment of the Constitution of India, extended the period of reserved seats in the parliament
• Eighth Amendment of the Constitution of Ireland, which recognized the equal right to life of an unborn child
• Eighth Amendment to the Constitution of Pakistan, which changed Pakistan's government from a parliamentary system to a semi-presidential system
• Eighth Amendment of the Constitution of South Africa, which allowed members of municipal councils to cross the floor from one political party to another without losing their seats

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