Sir Ewan Forbes, 11th Baronet

Sir Ewan Forbes Bt, MBChB
Sir Ewan in 1952
Tenure	1968–1991
Predecessor	William Forbes-Sempill, 19th Lord Sempill
Successor	John Alexander Cumnock Forbes, 12th Baronet
Other names	Ewan Forbes-Sempill
Born	Elizabeth Forbes-Sempill (1912-09-06)6 September 1912
Died	12 September 1991(1991-09-12) (aged 79)
Residence	Brux Castle
Spouse(s)	Isabella Mitchell ​ (m. 1952)​
Parents	John Forbes-Sempill, 18th Lord Sempill Gwendolyn Prodger
Occupation	General practitioner, farmer

Sir Ewan Forbes, 11th Baronet, MBChB (6 September 1912 – 12 September 1991), was a Scottish nobleman, general practitioner and farmer. Forbes was a trans man; he was christened Elizabeth Forbes-Sempill and officially registered as the youngest daughter of John, Lord Sempill. After an uncomfortable upbringing, he began presenting as a man in the 1930s, following a course of medical treatments in Germany. He formally re-registered his birth as male in 1952, changing his name to Ewan, and was married a month later.

In 1965, he stood to inherit the baronetcy of his elder brother William, Lord Sempill, together with a large estate. This inheritance was challenged by his cousin, who argued that the re-registration was invalid; under this interpretation, Forbes would legally be considered a woman, and thus unable to inherit the baronetcy. The legal position was unclear, and it took three years before a ruling by the Court of Session, which held him to be intersex, finally led to the Home Secretary recognising his claim to the title. The case was heard in great secrecy, with the effect that it was unable to be considered in other judgments on the legal recognition of gender variance, but has become more widely known since his death in 1991.