Sir Robert Grant CB KCB GCB (10 August 1837 – 8 January 1904) was a British lieutenant-general and royal engineer.
His mother was Margaret (d. 1885), only daughter of Sir David Davidson of Cantray, Nairnshire, N.B., who married as her second husband Lord Josceline William Percy, M.P., second son of George fifth duke of Northumberland.
In February 1857 he was transferred to the Jamaica command in the West Indies, and at the end of 1858 he served on the staff as fort adjutant at Belise in British Honduras.
He was at home for the final examination at the Staff College, in which he again easily passed first, despite his absence from the classes, and from January to June 1861 he was attached to the cavalry and artillery at Aldershot.
He was promoted colonel in the army on 1 July 1882, and a year later was placed on half pay.
On 20 March 1885 he left Edinburgh suddenly for Egypt to join Lord Wolseley, who had telegraphed for his services, as colonel on the staff and commanding royal engineer with the Nile expeditionary force.
He served with the headquarters staff and afterwards in command of the Abu Fatmeh district during the evacuation, but he was taken seriously ill with fever and was invalided home in August.
Not anticipating so speedy a termination to the campaign, the authorities had filled up his appointment in Scotland and he had to wait nearly a year on half pay.
On 1 July 1886 Grant was appointed deputy adjutant-general for royal engineers at the war office.
His health was failing, and he died on 8 January 1904 at his residence, 14 Granville Place, Portman Square, London, and was buried in Kensal Green cemetery.
There were three children of the marriage, a daughter who died young, and twin sons, both in the army, of whom the younger, Robert Josceline, was killed at Spion Kop on 24 January 1900.
; and (2) in 1890 Lady Florence Lucia, daughter of Admiral Sir Edward Alfred John Harris, and sister of the fourth earl of Malmesbury.