The 4th Parliament of Lower Canada was in session from January 9, 1805, to April 27, 1808. Elections to the Legislative Assembly in Lower Canada had been held in July 1804. All sessions were held at Quebec City.
| Riding | Member |
|---|---|
| Bedford | William Sturge Moore (1805) |
| Buckinghamshire | François Legendre |
| Buckinghamshire | Louis Proulx |
| Cornwallis | Jacques-Nicolas Perrault |
| Cornwallis | Alexandre Roy |
| Devon | Jean-Baptiste Fortin |
| Devon | François Bernier |
| Dorchester | Jean-Thomas Taschereau |
| Dorchester | John Caldwell |
| Effingham | André Nadon |
| Effingham | Thomas Porteous |
| Gaspé | George Pyke |
| Hampshire | Antoine-Louis Juchereau Duchesnay |
| Hampshire | Joseph-Bernard Planté |
| Hertford | Louis Turgeon |
| Hertford | Étienne-Ferréol Roy |
| Huntingdon | Alexander MacKenzie |
| Huntingdon | Jean-Baptiste Raymond |
| Kent | François Viger |
| Kent | Pierre Weilbrenner |
| Leinster | Jean Archambault |
| Leinster | Charles-Gaspard Tarieu de Lanaudière |
| Montreal County | Benjamin Joseph Frobisher |
| Montreal County | Louis Roy Portelance |
| Montreal East | James McGill |
| Montreal East | Louis Chaboillez |
| Montreal West | John Richardson |
| Montreal West | Jean-Marie Mondelet |
| Northumberland | Pierre-Stanislas Bédard |
| Northumberland | Jean-Marie Poulin |
| Orléans | Jérôme Martineau |
| Quebec County | Pierre-Amable de Bonne |
| Quebec County | Michel-Amable Berthelot Dartigny |
| Quebec (Lower Town) | Ignace-Michel-Louis-Antoine d'Irumberry de Salaberry |
| Quebec (Lower Town) | John Young |
| Quebec (Upper Town) | Jean-Antoine Panet |
| Quebec (Upper Town) | William Grant [1] |
| John Blackwood (1805) | |
| Richelieu | Louis Bourdages |
| Richelieu | Louis Brodeur |
| Saint-Maurice | David Monro |
| Saint-Maurice | Michel Caron |
| Surrey | Jacques Cartier |
| Surrey | Noël de Rastel de Rocheblave |
| Trois-Rivières | John Lees [2] |
| Ezekiel Hart (1807) [3] | |
| Trois-Rivières | Louis-Charles Foucher |
| Warwick | Ross Cuthbert |
| Warwick | James Cuthbert |
| William-Henry | Jonathan Sewell |
| York | Nicolas-Eustache Lambert Dumont |
| York | John Mure |
Notes
| Preceded by 3rd Parliament of Lower Canada | Parliaments in Lower Canada 1804-1808 | Succeeded by 5th Parliament of Lower Canada |