A referendum on Amendment 1 to the Constitution of Hawaii was held on 5 November 2024. The amendment repealed the Hawaii legislature's ability to limit marriage to heterosexual couples, reversing the 1998 Hawaii Amendment 2. The majority of the voters backed the measure; it succeeded in all four of Hawaii's major counties. The wording of the ballot language proved confusing to a number of voters, who were unsure of what the amendment accomplished. The amendment passed simultaneously with similar ones in California and Colorado.