Sir David Deas KCB (7 October 1807[1] – 15 January 1876) was a Scottish medical officer in the Royal Navy.
He saw much service, and was promoted to be a surgeon 2 July 1836, and before his return to England in 1842 took part in the operations on the coast of Syria.
He was advanced to the rank of deputy-inspector of hospitals and fleets 24 June 1854, and in the Britannia was present at the engagement with the sea defences of Sebastopol on 17 October.
From June 1857 until 1859 he had medical charge of the fleet on the coast of China, and his attention to the sick and wounded at the capture of Canton 28/29 December 1857 gained for him special mention.
He died at the residence of his brother, Sir George Deas, Lord Deas, 32 Heriot Row, Edinburgh, 15 January 1876, and was buried in the Warriston Cemetery, Edinburgh, on 19 January, close to the east wall near the old East Gate (now sealed).