Margaret Gallagher is an American writer, socially conservative commentator, and activist. She wrote a syndicated column for Universal Press Syndicate from 1995 to 2013 and has written several books. Gallagher founded the Institute for Marriage and Public Policy, a small, socially conservative think tank. She is also a co-founder of the National Organization for Marriage (NOM), an advocacy group which opposes same-sex marriage and other legal recognition of same-sex partnerships; she has served as president and as chairman of the board of NOM.

The National Organization for Marriage (NOM) is an American non-profit political organization established to work against the legalization of same-sex marriage in the United States. It was formed in 2007 specifically to pass California Proposition 8, a state prohibition of same-sex marriage. The group has opposed civil union legislation and gay adoption, and has fought against allowing transgender individuals to use bathrooms that accord with their gender identity. Brian S. Brown has served as the group's president since 2010.