UK Supreme Court defines 'woman' on biological terms in blow to transgender movement

 April 17, 2025

In a historic decision, the UK Supreme Court has ruled that the legal definition of "woman" under equality legislation refers solely to biological sex, not gender identity.

CNN reported that the ruling specifically affects the interpretation of the Equality Act 2010, excluding trans women from this definition even if they possess a Gender Recognition Certificate.

The legal challenge that led to this ruling originated in 2018 with Scottish campaigners concerned with the representation of women on boards.

The question posed was whether trans women with a Gender Recognition Certificate should be considered women for the Equality Act.

Supreme Court Unanimously Backs Biological Definition

The court delivered a unanimous verdict in favor of the group For Women Scotland, which argued that legal gender should strictly align with biological sex. Lord Patrick Hodge stated, "The terms woman and sex in the Equality Act 2010 refer to a biological woman and biological sex."

This landmark decision articulated that interpreting "sex" as certified sex would disrupt the coherent definition of "man" and "woman" within the law. β€œThe provisions relating to sex discrimination can only be interpreted as referring to biological sex,” remarked Hodge during the ruling.

Following the court's decision, the UK government reiterated its commitment to safeguarding single-sex spaces such as hospitals and sports clubs. A government spokesperson emphasized, "Single-sex spaces are protected in law and will always be protected by this Government."

Despite the exclusions in definitions, the court clarified that transgender individuals are still shielded from discrimination under the statutes of gender reassignment. "This ruling does not strip away the protections from trans people," confirmed Hodge, highlighting the legal safeguards that remain for the transgender community.

Impact on the Transgender Community and Advocacy Groups

Reaction to the ruling was swift and divided. LGB Alliance described the decision as "a watershed for women," appreciating the prioritization of biological sex in legal terms. Conversely, advocacy group Stonewall labeled the outcome as "incredibly worrying for the trans community."

Ella Morgan, a trans advocate, expressed her dismay, stating, "Today for the first time, I am scared about walking out of my front door." She reflected on the broader consequences this ruling could have on personal safety and societal acceptance for trans individuals in the UK.

Amnesty International, while acknowledging the concerning aspects for trans individuals, stressed the ongoing protections against discrimination and harassment under existing laws.

"This ruling has potentially concerning consequences for trans people, but it is important to stress that the court has been clear that trans people are protected under the Equality Act against discrimination and harassment," they stated.

This Supreme Court decision not only reshapes the landscape of gender and sex in the realm of UK law but also sets a significant precedent that may influence other jurisdictions and future legal interpretations relating to gender identity and equality.

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