For Women Scotland (FWS) is a Scottish grassroots campaign group founded in June 2018 in response to the Scottish Government's plans to reform the Gender Recognition Act to allow for self-declaration of sex. A registered not-for-profit company (SC669393), FWS operates entirely through volunteer effort and receives no public funding. The organization is directed by Trina Budge, Marion Calder, and Susan Smith.

FWS campaigns to protect and strengthen the sex-based rights of women and girls across Scotland, opposing the replacement of biological sex with gender identity in law, public policy, and institutional practice. The organization challenges government-funded lobby groups that seek to overwrite sex-based protections with the concept of gender identity, and highlights the impact of such policies on women and girls in hospitals, schools, prisons, sports, and women's sector organizations.

FWS has pursued several landmark legal challenges. In 2021, the organization won a judicial review establishing that it was unlawful for the Scottish Government to redefine "woman" on a self-identification basis under the Gender Representation on Public Boards (Scotland) Act 2018. In April 2025, a subsequent Supreme Court ruling — the culmination of FWS's sustained legal campaign — confirmed that the terms "woman" and "sex" in the Equality Act 2010 refer to biological woman and biological sex.