Gender identity describes a person’s deeply felt internal sense of their own gender (for example, male, female, non-binary or another identity), which may or may not correspond with the sex registered at birth. In legal practice across England & Wales, Scotland, Northern Ireland and Ireland, the term is used in equality, discrimination, employment, education, healthcare and family law to identify and protect individuals on the basis of how they understand and live their gender. In the UK, “gender reassignment” is the main protected characteristic under the Equality Act 2010, but “gender identity” is widely used in policies, guidance and case law discussions, particularly in transgender discrimination and harassment claims. Scotland, Northern Ireland and Ireland similarly use gender identity in human rights and equality contexts, often alongside “gender expression” and “transgender status”. The term is not uniformly or exhaustively defined in all relevant statutes, but is treated by courts, tribunals, regulators and public bodies as a descriptive concept informing interpretation of discrimination law, human rights obligations, reasonable accommodation, data protection, safeguarding and drafting of workplace and organisational policies.