8th Bart of Luss (1773-). Son of Sir Ludovick Grant (1707-1773) and Margaret Ogilvy (d. 1757). Married Jane Duff in 1763.
Grant was educated at Westminster School, London and at Christ's College, Cambridge. He succeeded his father as Member of Parliament for Elginshire in 1761, a seat he held until 1768, and from 1790 to 1795 was MP for Banffshire, succeeding James Ferguson.
Boswell met a Mr. Grant, son to Sir Ludovic at Lady Frances Erskine's on February 29, 1763.