The Fifteenth Amendment (Amendment XV) to the United States Constitution prohibits the federal government and each state from denying or abridging a citizen's right to vote "on account of race, color, or previous condition of servitude."

The Fifteenth Amendment of the Constitution Act 1995 (previously bill no. 15 of 1995) is an amendment of the Constitution of Ireland which removed the constitutional prohibition on divorce, and allowed for the dissolution of a marriage provided specified conditions were satisfied.