Mrs. Thomas Gage is a 1771 oil painting on canvas by John Singleton Copley.
The portrait depicts Margaret Kemble Gage, the American-born wife of the British General Thomas Gage, commander-in-chief of the British forces in North America. It was painted in New York during a six-month stay there by Bostonian Copley. The work was displayed at the Society of Artists Exhibition of 1772 in London.