Mixed marriage or intermarriage may refer to:
- Exogamy, the act of marrying outside of one's own social group (the opposite of endogamy)
- Interracial marriage, between people of different races
- Miscegenation, a pejorative term for interracial sexual relationships
- Interethnic marriage, between people of different ethnicities
- Interfaith marriage, between people who adhere to different religions
- Interdenominational marriage, between people who adhere to different sects of the same religion
- Interracial marriage, between people of different races
- Marital conversion, the act of converting to one's partner's religion in order to facilitate marriage and thereby assimilate into their society
- Royal intermarriage, between people belonging to different royal dynasties
- Transnational marriage, between people who are not citizens of the same country
- Mixed-orientation marriage, between people who do not have corresponding sexual orientations
- Lavender marriage, between a man and a woman who seek to feign heterosexuality
- Mixed Marriage (play), a 1911 Irish play