Sir James Monteith Grant KCVO, WS, FSA Scot. (19 October 1903 – 1 December 1981) was Lord Lyon King of Arms of Scotland from 1969 to 1981.

Educated at the Edinburgh Academy and the University of Edinburgh where he studied law, he was appointed a Writer to the Signet in 1927. His first heraldic appointment was as Carrick Pursuivant in 1946. He was promoted to Marchmont Herald in 1957 and then to Lord Lyon in 1969. He was also Secretary to the Order of the Thistle from 1971 until 1981. From his retirement as Lord Lyon in 1981, he again held the post of Marchmont Herald until his death later that year.

He was a Fellow of the Society of Antiquaries of Scotland, a Knight of the Order of St John (from 1970), and a Grand Officer (Class II) of the Order of the Polar Star of Sweden from 1975. He was appointed a KCVO in 1969.

Honours

• 1975 Honourary Fellow, Royal Heraldry Society of Canada
• 1969 Knight Commander of the Royal Victorian Order