| Honorific-Prefix: | The Hon. |
| James Alexander Robb | |
| Constituency Mp: | Huntingdon |
| Parliament: | Canadian |
| Predecessor: | Robert Nelson Walsh |
| Successor: | District was abolished in 1914 |
| Term Start: | 1908 |
| Term End: | 1917 |
| Constituency Mp2: | Châteauguay—Huntingdon |
| Parliament2: | Canadian |
| Predecessor2: | District was created in 1914 |
| Successor2: | Dennis James O'Connor |
| Term Start2: | 1917 |
| Term End2: | 1929 |
| Birth Date: | 10 August 1859 |
| Birth Place: | Huntingdon, Canada East |
| Death Place: | Toronto, Ontario |
| Party: | Liberal |
James Alexander Robb, (10 August 1859 - November 11, 1929) was a Canadian Member of Parliament and cabinet minister. Robb was a member of the Liberal Party of Canada.
He served as Liberal Party Whip from 1919 to 1921.
From 5 September 1925 to 28 June 1926 and again from 25 September 1926 until his death, he served as Minister of Finance in the administration of William Lyon Mackenzie King. He served briefly as Acting Minister of National Defence in October 1926.