Anti-marriage law may refer to:
Race-based anti-marriage laws:
Anti-miscegenation laws, including: Prohibition of Mixed Marriages Act, in South Africa The Gesetz zum Schutze des deutschen Blutes und der deutschen Ehre, one of the Nuremberg Laws in Nazi Germany
Gender-based anti-marriage laws:
The U.S. federal Defense of Marriage Act The Federal Marriage Amendment, which failed to pass Hawaii Constitutional Amendment 2 (1998) California Proposition 22 (2000) North Carolina Amendment 1