The National Organization for Women (NOW) is an American feminist organization. Founded in 1966, it is legally a 501(c)(4) social welfare organization. The organization consists of 550 chapters in all 50 U.S. states and in Washington, D.C. It is the largest feminist organization in the United States with around 500,000 members. NOW is regarded as one of the main liberal feminist organizations in the US, and primarily lobbies for gender equality within the existing political system. NOW campaigns for constitutional equality, economic justice, reproductive rights, LGBTQIA+ rights and racial justice, and against violence against women.

Liberal feminism, also called mainstream feminism, is a main branch of feminism defined by its focus on achieving gender equality through political and legal reform within the framework of liberal democracy and informed by a human rights perspective. It is often considered culturally progressive and economically center-right to center-left. As the oldest of the "Big Three" schools of feminist thought, liberal feminism has its roots in 19th century first-wave feminism seeking recognition of women as equal citizens, focusing particularly on women's suffrage and access to education, the effort associated with 19th century liberalism and progressivism. Liberal feminism "works within the structure of mainstream society to integrate women into that structure." Liberal feminism places great emphasis on the public world, especially laws, political institutions, education and working life, and considers the denial of equal legal and political rights as the main obstacle to equality. As such liberal feminists have worked to bring women into the political mainstream. Liberal feminism is inclusive and socially progressive, while broadly supporting existing institutions of power in liberal democratic societies, and is associated with centrism and reformism. Liberal feminism tends to be adopted by white middle-class women who do not disagree with the current social structure; Zhang and Rios found that liberal feminism with its focus on equality is viewed as the dominant and "default" form of feminism. Liberal feminism actively supports men's involvement in feminism and both women and men have always been active participants in the movement; progressive men had an important role alongside women in the struggle for equal political rights since the movement was launched in the 19th century.