Sir Percy Alexander McElwaine KC (21 September 1884 – 24 October 1969) was a lawyer and judge who served, inter alia, as Attorney General of Fiji and Chief Justice of the Straits Settlements.

[1] McElwaine married Evelyn Annie Forsaith Macnaught at St Mary Le Park in Battersea, London, on 17 June 1914.

His photograph is in a display at the former Supreme Court of Singapore, now called The Arts House.

While Chief Justice of the Straits Settlements, McElwaine was unsympathetic to the idea of appointing "Asiatics", as he called Asians, to senior judicial posts.

"I am doubtful whether any Asiatic is suitable for the post of Registrar of the Supreme Court, whatever his professional qualifications be," he declared on 29 August 1938.