James Alexander Sangster (November 19, 1861 – June 23, 1937) was an Ontario merchant and political figure.
He represented Glengarry in the Legislative Assembly of Ontario from 1923 to 1926 and from 1929 to 1937 as a Liberal member.
He was born in Bainsville, Lancaster Township, Canada West, the son of George Sangster.
On April 26, 1918, Sangster won approval for his bill pertaining to driving on the right side of the road.
From that day on, all vehicles, motorized or non-motorized, have had to comply with this new regulation all over Canada.