Brian S. Brown (born c. 1974) is an American activist who is a co-founder of the National Organization for Marriage (NOM), and has served as its president since 2010, having previously served as executive director. NOM is a non-profit political organization established in 2007 to work against legalization of same-sex marriage in the United States. NOM's mission is "protecting marriage and the faith communities that sustain it". Brown is also president of the World Congress of Families.