The 4th Parliament of Upper Canada was opened 1 February 1805. Elections in Upper Canada had been held in May 1804. All sessions were held at Parliament Buildings of Upper Canada in York, Upper Canada. This parliament was dissolved 21 May 1808.
This House of Assembly of the 4th Parliament of Upper Canada had four sessions 1 February 1805 to 16 March 1808: [1]
| Sessions [1] | Start | End |
|---|---|---|
| 1st | 1 February 1805 | 2 March 1805 |
| 2nd | 4 February 1806 | 3 March 1806 |
| 3rd | 2 February 1807 | 10 March 1807 |
| 4th | 20 January 1808 | 16 March 1808 |
| Riding | Member | First elected/ previously elected |
|---|---|---|
| Dundas | John Crysler | 1804 |
| Durham, Simcoe & 1st York | Angus Macdonell [2] | 1801 |
| William Weekes (1805) [3] | 1805 | |
| Robert Thorpe (January 1807) | 1807 | |
| Essex | Matthew Elliott | 1804 |
| Essex | David Cowan | 1804 |
| Frontenac | Allan McLean | 1804 |
| Glengarry & Prescott | Alexander Macdonell – Speaker 1804–1808 | 1800 |
| Glengarry & Prescott | Walter Butler Wilkinson | 1804 |
| Grenville | Samuel Sherwood | 1800 |
| Hastings & Northumberland | David McGregor Rogers | 1800 |
| Kent | John McGregor | 1804 |
| Leeds | Peter Howard | 1804 |
| Lennox & Addington | Thomas Dorland | 1804 |
| 2nd, 3rd, 4th Lincoln | Ralfe Clench | 1800 |
| 2nd, 3rd, 4th Lincoln | Isaac Swayze | 1792, 1800 |
| 2nd Lincoln | Samuel Street | 1796 |
| Norfolk, Oxford & Middlesex | Benajah Mallory | 1804 |
| Prince Edward | Ebenezer Washburn | 1800 |
| Stormont & Russell | Robert Isaac Dey Gray [4] | 1796 |
| D'Arcy Boulton (February 1806) | 1806 | |
| West York, 1st Lincoln & Haldimand | Robert Nelles | 1800 |
| West York, 1st Lincoln & Haldimand | Solomon Hill [5] | 1804 |
| Joseph Willcocks (January 1808) | 1808 |