Robert McClellan (January 1747 County Londonderry, Ireland – October 8, 1817 Albany, Albany County, New York) was an Irish-born American merchant and politician.
His older brother took him to Albany, New York where he became a merchant.
In 1771, Robert married Jane Williams in Albany, and they had nine children.
Beginning in 1780, he was elected to the Albany City Council, first as assistant, then as alderman.
In 1798, he was appointed New York State Treasurer, a post he held until his resignation on January 31, 1803, after the discovery of a shortage of $33,000 in the Treasury accounts.