Alexander Hume-Campbell, 2nd Earl of Marchmont PC (1675 – 27 February 1740), was a Scottish nobleman, politician and judge.
The third but eldest surviving son of Patrick Hume, 1st Earl of Marchmont, by his spouse Grisel (d.1703), daughter of Sir Thomas Ker of Cavers, he assumed the additional surname of Campbell upon his marriage in 1697 with Margaret (d. 1722), daughter and heiress of Sir George Campbell of Cessnock, Ayrshire.
He was appointed to the Court of Session in 1704 with the judicial title Lord Cessnock, and served there until 1714.
Alexander served as one of the founding governors of Britain's first childcare charity, the Foundling Hospital, which received its royal charter in 1739.
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