John Hillyard Cameron, QC (April 14, 1817 – November 14, 1876) was an Ontario lawyer, businessman and political figure.

In 1839, he was called to the bar in Upper Canada and entered a law practice in Toronto, Ontario.

He supported representation by population and opposed the introduction of an elected Legislative Council.

In 1856, he helped stir up controversy in the wake of the death of Robert Corrigan in Lotbinière, Quebec; this helped undermine the government of Allan MacNab which led to the rise of Sir John A. Macdonald as leader of the Conservatives.

He was a loyal follower of the Church of England and tried to defend its interests, including the revenue from the clergy reserves.