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.

Second-wave feminism was a period of feminist activity that began in the early 1960s and lasted roughly two decades, ending with the feminist sex wars in the early 1980s and being replaced by third-wave feminism in the early 1990s. It occurred throughout the Western world and aimed to increase women's equality by building on the feminist gains of the late 19th and early 20th centuries.