Robert Lyon (July 6, 1829–1888) was a judge and politician in the County of Carleton in eastern Ontario. He was mayor of Ottawa in 1867 and a Liberal member of the Legislative Assembly of Ontario from 1867 to 1871.
His father, George Lyon, was a Scottish captain in the British army, who settled in Richmond, Ontario. His oldest brother was George Byron Lyon, another mayor of Ottawa.
He studied law and was called to the bar in 1853. He began practicing law in Ottawa in 1856. He became an alderman and later mayor. Lyon also represented Carleton in the Ontario legislature from 1867 to 1871. He was named a judge for Carleton County in 1873.
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| Preceded by Moss Kent Dickinson |
Mayor of Ottawa 1867 |
Succeeded by Henry J. Friel |