- Coalition for Marriage, Family & Couples Education, L.L.C.
 - Clearinghouse for marriage and relationship programmes. Includes articles, directory, conferences and seminars. - Alliance for Marriage
- Non-partisan research and education organisation dedicated to promoting marriage and addressing the epidemic of fatherless families in the United States.
- Alternatives to Marriage Project (ATMP)
- Provides resources, advocacy, and support for people who are unmarried, cohabit, are domestic partners, are living together, or are thinking about whether to marry.
- Straight Spouse Support Network
- Provides support and information to straight spouses and former spouses of gay, lesbian, and bisexual mates.
- Marriage Encounter (5)
- Equality in Marriage Institute
- Provides information, resources, and support for women and men before, during, and after marriage.
- Hongkong Catholic Marriage Advisory Council
- Commited to promoting happy marriages and effective parenthood.
- Petition of Support for the Federal Marriage Amendment
- Attempting to gather one million names.
- United Front Japan
- Not-for-profit organisation working to promote the welfare and legal rights of non-Japanese individuals with Japanese spouses.
- Association for Couples in Marriage Enrichment (2)
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