Lord Duncan was a slave ship whose origins are obscure.

She made one voyage in 1798–1799 in the triangular trade in enslaved people.

Captain John Hodgson (or Hudson[1]), sailed from Liverpool on 5 December 1798, bound for the Bight of Benin.

[1] Lord Duncan arrived at Kingston on 20 November 1799 with 194 captives.

[2] Lord Duncan sailed from Jamaica, bound for Liverpool, but had to put back and was condemned.