The UK Supreme Court has ruled that the term “woman” in the Equality Act 2010 refers strictly to biological sex.
In a landmark decision on Tuesday, the UK Supreme Court ruled unanimously that the legal definition of a woman under the Equality Act 2010 applies only to biological women, even if a transgender woman holds a gender recognition certificate,GCR.
The ruling was delivered by five judges, led by Lord Hodge, in a case brought by gender-critical campaigners against the Scottish government’s attempt to expand the definition to include trans women.
The court held that interpreting sex as “certificated sex” would create inconsistencies within the Equality Act and undermine the clarity of the protected characteristic of sex.
Lord Hodge said, “It would create heterogeneous groupings,” and stressed that issues like pregnancy, maternity, and biological risk protections could only be logically applied to biological women.
As a result, transgender women will no longer be allowed to occupy public board positions or access spaces and services legally reserved for women. The judgment impacts public policy areas including healthcare, sports, education, and women-only charities.
The UK government welcomed the ruling, saying it “brings clarity and confidence” to those managing single-sex services such as hospitals and women’s refuges.
A spokesperson reiterated the government’s commitment to safeguarding single-sex spaces based on biological sex.
Scottish First Minister John Swinney acknowledged the court’s decision and stated the government would engage constructively with its implications, emphasizing that protecting the rights of all remains central.
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The ruling is a setback for the Scottish government and trans rights campaigners, who had argued that legal recognition under the 2004 Gender Recognition Act allowed transgender women the same status as biological women.
Scottish Trans, a campaign group, described the ruling as a shock and a reversal of two decades of legal understanding. “We will continue working for a world where trans people can live with dignity, privacy, and safety,” it said.
Ellie Gomersall, a trans woman and member of the Scottish Green Party, expressed deep disappointment, saying the ruling “undermines vital human rights” and called for UK law reform to ensure full equality for trans people.
The court also expressed concern over the creation of “two sub-groups” of women, which could confuse institutions due to the confidentiality surrounding GRCs.
Gender-critical campaigners celebrated the outcome. For Women Scotland, backed by author JK Rowling, praised the court for upholding the reality of biological sex.
Maya Forstater, co-founder of Sex Matters, said, “The court has given us the right answer: the protected characteristic of sex – male and female – refers to reality, not to paperwork.”
While the Equality and Human Rights Commission supported the Scottish government’s position, it welcomed the judgment for clarifying challenges around maintaining single-sex and lesbian-only spaces.
Though urging respect for trans people’s rights and protections under the Equality Act, Lord Hodge affirmed that certain services and spaces – such as women’s sports, communal accommodations, and medical facilities – can only function effectively when defined by biological sex.
The ruling sets a precedent likely to influence future policymaking in gender-sensitive sectors across the UK.
