Lewis Grant-Ogilvy, 5th Earl of Seafield

Lewis Alexander Grant-Ogilvy, 5th Earl of Seafield (22 March 1767-26 October 1840), briefly known as Sir Lewis Alexander Grant, 9th Baronet, in 1811, was a Scottish peer and Member of Parliament.

Seafield was the son of Sir James Grant, 8th Baronet, and Jean Duff. He was elected to the House of Commons for Elginshire in 1790, a seat he held until 1796. In February 1811 he succeeded his father as ninth Baronet of Colquhoun. Eight months later, in October 1811, he became the fifth Earl of Seafield on the death of his second cousin James Ogilvy, 7th Earl of Findlater and 4th Earl of Seafield. Seafield was the grandson of Lady Margaret Ogilvy, daughter of the prominent statesman James Ogilvy, 4th Earl of Findlater and 1st Earl of Seafield. However, he was not in remainder to the earldom of Findlater which title became extinct. He assumed the additional surname of Ogilvy on succeeding in the earldom.

Lord Seafield never married. He died in October 1840, aged 73, and was succeeded by his younger brother Francis William Ogilvy-Grant.