Lewis Alexander Grant-Ogilvie, 5th Earl of Seafield, FRSE (22 March 1767 – 26 October 1840) was a Scottish nobleman.
His proposers were Dugald Stewart, James Gregory, and Andrew Dalzell.
He died at Cullen House in Banffshire on 26 October 1840, aged 73, and was buried in the Mausoleum in Duthil Old Parish Church and Churchyard.
He was succeeded by his younger brother Francis William Ogilvie-Grant who had already taken over all practical duties and curatorship of the estates from the point of Alexander's mental instability.
His uncles included Henry Mackenzie and Alexander Penrose Cumming-Gordon.