Interfaith marriage, sometimes called interreligious marriage or "mixed marriage", is marriage between spouses professing different religions. Although interfaith marriages are often established as civil marriages, in some instances they may be established as a religious marriage. This depends on religious doctrine of each of the two parties' religions; some prohibit interfaith marriage, and among others there are varying degrees of permissibility.
Several major religions are mute on the issue, and still others allow it with requirements for ceremony and custom. For ethno-religious groups, resistance to interfaith marriage may be a form of self-segregation.
In an interfaith marriage, each partner typically adheres to their own religion. One issue which can arise in such unions is the choice of faith in which to raise the children.