The Twenty-eighth Amendment may refer to:
Twenty-eighth Amendment of the Constitution of India, 1972 amendment relating to conditions for the civil services of India Twenty-eighth Amendment of the Constitution of Ireland (2009), which permitted the state to ratify the Treaty of Lisbon. Twenty-eighth Amendment of the Constitution Bill 2008, an unsuccessful proposed amendment to the Constitution of Ireland, which would have permitted the state to ratify the Treaty of Lisbon. Constitution (Twenty-eighth Amendment) Act, 2017, an unsuccessful proposed amendment to the Constitution of Pakistan, which would have reauthorized the speedy trial military courts earlier established in accordance with the expired Twenty-first Amendment to the Constitution. List of proposed amendments to the Constitution of the United States, proposed amendments that would become the 28th Amendment if ratified Equal Rights Amendment, referred to as the 28th Amendment by President Joe Biden, disputed