The Twenty-fourth Amendment of the Constitution Bill 2001 (bill no. 19 of 2001) was a proposed amendment to the Constitution of Ireland to allow the state to ratify the Treaty of Nice of the European Union. The proposal was rejected in a referendum held on June 2001, sometimes referred to as the first Nice referendum. The referendum was held on the same day as referendums on the prohibition of the death penalty and on the ratification of the Rome Statute of the International Criminal Court, both of which were approved.