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Alexander Macomb (1748–1831) was an American fur trader, merchant and land speculator known for purchasing nearly four million acres from the state of New York after the American Revolutionary War. A Loyalist sympathizer, he operated from New York City after the war. His mansion in the city was used by President George Washington for several months in 1790 as the temporary president's mansion.
Macomb had already made a fortune on land speculation in North Carolina, Georgia, and Kentucky, and believed he would make more profit in New York. Unable to sell the New York land fast enough to meet his debts, however, he was sent to debtors' prison for a period and never regained his fortune.