Robert William Lyall-Grant (10 September 1875 – 1955) was Chief Justice of Jamaica from August 1932. He had previously been Attorney General of Kenya and a puisne judge of Ceylon.

Lyall-Grant was born the son of John Lyall-Grant in Aberdeen, Scotland and educated at Aberdeen Grammar School and at Aberdeen and Edinburgh Universities, where he studied law as a Vans Dunlop scholar. He was called to the bar in 1903.^[1]

After working in practice until 1909 he moved to Africa to take up the post of Attorney General of Nyasaland before serving as a High Court judge there. In July 1920 he was appointed Attorney General of Kenya before being promoted in 1926 to be a Puisne Judge in Ceylon.^[2] His final appointment in August 1932 was that of Chief Justice of Jamaica.^[3]

He retired in 1936.^[4]