反异族通婚法是在亲密关系和婚姻层面上强制进行种族隔离的一种法律，将异族婚姻以及跨越种族的性爱罪恶化。这类法律最早出现在17世纪北美的十三个殖民地（美国雏形），随后存在于美国各州和美国属地。自1863年，美国开始用miscegenation一词来称呼。在第二次世界大战中，美国的一些州开始撤销反异族通婚法并使其合法化。直至1967年于美国彻底消失。在纳粹德国和南非也曾实行过类似法律。

Anti-miscegenation laws or miscegenation laws were laws that enforced racial segregation at the level of marriage and intimate relationships by criminalizing interracial marriage and sometimes also sex between members of different races. Such laws were first introduced in North America from the late seventeenth century onwards by several of the Thirteen Colonies, and subsequently by many US states and US territories and remained in force in many US states until 1967. After the Second World War, an increasing number of states repealed their anti-miscegenation laws. In 1967, in Loving v. Virginia, the remaining anti-miscegenation laws were held to be unconstitutional by the Supreme Court of the United States. Similar laws were also enforced in Nazi Germany as part of the Nuremberg laws, and in South Africa as part of the system of Apartheid. In the United States, interracial marriage, cohabitation and sex have been termed "miscegenation" since the term was coined in 1863. Contemporary usage of the term is less frequent, except to refer to historical laws banning the practice.