3rd Parliament of Upper Canada
The 3rd Parliament of Upper Canada was opened 28 May 1801. Elections in Upper Canada had been held in July 1800. All sessions were held at Parliament Buildings of Upper Canada in York, Upper Canada. This parliament was dissolved 14 May 1804.
This House of Assembly of the 3rd Parliament of Upper Canada had four sessions 28 May 1801 to 9 March 1804:
| Sessions | Start | End |
| 1st | 28 May 1801 | 9 July 1801 |
| 2nd | 25 May 1802 | 7 July 1802 |
| 3rd | 24 January 1803 | 5 March 1803 |
| 4th | 1 February 1804 | 9 March 1804 |
| Riding | Member |
| Dundas | Jacob Weager |
| Durham, Simcoe & 1st York | Henry Allcock unseated |
| Angus Macdonell | |
| Essex | Matthew Elliott |
| Essex | Thomas McKee |
| Frontenac | John Ferguson |
| Glengarry & Prescott | Alexander Macdonell |
| Glengarry & Prescott | Angus Macdonell |
| Grenville | Samuel Sherwood |
| Hastings & Northumberland | David McGregor Rogers |
| Kent | Thomas McCrae |
| Leeds | William Buell |
| Lennox & Addington | Timothy Thompson |
| 2nd, 3rd, 4th Lincoln | Ralfe Clench |
| 2nd, 3rd, 4th Lincoln | Isaac Swayze |
| 2nd Lincoln | Samuel Street - Speaker 1800-1801 |
| Norfolk, Oxford & Middlesex | David William Smith - Speaker 1801-1804 |
| Prince Edward | Ebenezer Washburn |
| Stormont & Russell | Robert Isaac Dey Gray |
| West York, 1st Lincoln & Haldimand | Robert Nelles |
| West York, 1st Lincoln & Haldimand | Richard Beasley |