| Thomas A. Marshall | |
| Office1: | Ontario MPP |
| Term Start1: | 1914 |
| Term End1: | 1923 |
| Predecessor1: | Elisha Jessop |
| Successor1: | Robert Kemp |
| Constituency1: | Lincoln |
| Term Start2: | 1911 |
| Term End2: | 1914 |
| Predecessor2: | James Alway Ross |
| Successor2: | Riding abolished |
| Constituency2: | Monck |
| Party: | Liberal |
| Birth Date: | 25 November 1864 |
| Birth Place: | Dunn Township, Haldimand County, Canada West |
| Death Place: | Dunnville, Ontario |
| Spouse: | Elizabeth Lackie (m. 1905) |
| Occupation: | Merchant |
Thomas A. Marshall (November 25, 1864 - March 11, 1951) was a merchant and political figure in Ontario, Canada. He represented Monck from 1911 to 1914 and then Lincoln from 1914 to 1923 in the Legislative Assembly of Ontario as a Liberal member.
He was born in Dunn Township, Haldimand County, Canada West, the son of Henry Marshall.[1] Henry Marshall was an early pioneer of Dunn Township.[2] He was educated in Dunnville and at Toronto University. In 1905, he married Elizabeth Lackie. Marshall owned a hardware store. He served as director for the town telephone company and served on the board of education. Marshall served with the Queen's Own Rifles during the North-West Rebellion of 1885.[2]
He died in Dunnville, Ontario in 1951.[2]