Grant was the son of Sir James Grant, 6th Baronet, and Anne Colquhoun. He succeeded his father as seventh Baronet of Colquhoun in 1747. In 1741 Grant was elected to the House of Commons for Elginshire, a seat he held until 1761.
Grant married firstly Marian Dalrymple. He married secondly Lady Margaret Ogilvy, daughter of the statesman James Ogilvy, 4th Earl of Findlater and 1st Earl of Seafield.
He died in March 1773, aged 66, and was succeeded by his son from his second marriage, James Grant.
- "Grant, Sir Ludovick, 7th Bt". The History of Parliament. Retrieved 18 September 2014.
- Edinburgh and Leith Post Office directory 1775
|Parliament of Great Britain|
| Member of Parliament for Elginshire
|Baronetage of Nova Scotia|
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