Robert Isaac Dey Gray (ca. 1772 – October 8, 1804) was a lawyer, judge and political figure in Upper Canada. He was probably born in New York, but came to Canada with his parents (James Gray and Elizabeth Low) at the beginning of the American Revolution. He studied law and was called to the bar in 1794. In 1795, he became Solicitor General for the province. He became a district court judge for the Home District in 1796. He was elected to the 2nd Parliament of Upper Canada representing Stormont and the 3rd and 4th Parliament of Upper Canada representing Stormont and Russell.