Canadian Women's Sex-Based Rights (caWsbar) is a cross-Canada, non-partisan coalition of women and male allies working to preserve the rights and protections of women and girls as enshrined in the Canadian Charter of Rights and Freedoms (Section 15). Founded in 2019, caWsbar is one of Canada's largest and most active sex-based rights advocacy organizations.

caWsbar's primary legislative objective is to challenge the implications of Bill C-16 (2017), which added "gender identity or expression" to the Canadian Human Rights Act without clearly defining those terms — a change that has enabled males to access female-only spaces, services, and resources on the basis of self-declaration.

The organization has launched a Charter challenge through the Justice Centre for Constitutional Freedoms and Charter Advocates Canada against the federal government's policy of housing transgender-identifying males in women's prisons. caWsbar is a proud signatory to the Declaration on Women's Sex-Based Rights and has co-authored joint submissions with WDI Canada to CEDAW. It engages in public education, parliamentary submissions, legal challenges, and coalition-building across the country.