This is a list of U.S. states where the recognition and performance of same-sex marriage is explicitly banned either by the constitution or by statute.

1. Alabama (by constitution and statute);
2. Arkansas (by constitution and statute);
3. Florida (by constitution and statute);
4. Georgia (by constitution and statute);
5. Kansas (by constitution and statute); (Legalization of same-sex marriage is imminent.)
6. Louisiana (by constitution and statute);
7. Minnesota (by statute only);
8. Mississippi (by constitution and statue);
9. Missouri (by constitution and statute; recognition is legal);
10. Montana (by constitution and statute); (Legalization of same-sex marriage is imminent.)
11. Nebraska (by constitution and statute);
12. North Dakota (by constitution and statute);
13. Ohio (by constitution and statute);
14. South Carolina (by constitution and statute); (Legalization of same-sex marriage is imminent.)
15. Tennessee (by constitution and statute)