| James Alexander Sangster | |
| Office1: | Ontario MPP |
| Term Start1: | 1929 |
| Term End1: | 1937 |
| Predecessor1: | Angus McGillis |
| Successor1: | Edmund MacGillivray |
| Term Start2: | 1923 |
| Term End2: | 1926 |
| Predecessor2: | Duncan Alexander Ross |
| Successor2: | Angus McGillis |
| Constituency2: | Glengarry |
| Party: | Liberal |
| Birth Date: | 19 November 1861 |
| Birth Place: | Bainsville, Canada West |
| Death Place: | Toronto, Ontario |
| Occupation: | Merchant |
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. In 1891, he married Bertha H. Haines. He served on the township council, serving ten years as reeve and warden for the United Counties of Stormont, Dundas and Glengarry in 1922. Sangster was a merchant in Bainsville in partnership with D. D. McCuaig. He died in office in 1937.
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.[1]